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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2016	Apr. 30, 2016
Entity Information [Line Items]
Entity Registrant Name	Summit Midstream Partners, LP
Entity Central Index Key	0001549922
Document Type	10-Q
Document Period End Date	Mar. 31, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q1
Common units
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		66,587,235
General Partner Units
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1,354,700

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 13,087	$ 21,793
Accounts receivable	49,550	89,581
Other current assets	2,887	3,573
Total current assets	65,524	114,947
Property, plant and equipment, net	1,833,765	1,812,783
Intangible assets, net	452,667	461,310
Goodwill	16,211	16,211
Investment in equity method investees	757,869	751,168
Other noncurrent assets	8,847	8,253
Total assets	3,134,883	3,164,672
Current liabilities:
Trade accounts payable	18,783	40,808
Due to affiliate	395	1,149
Deferred revenue	677	677
Ad valorem taxes payable	4,288	10,271
Accrued interest	7,733	17,483
Accrued environmental remediation	6,687	7,900
Other current liabilities	12,523	13,297
Total current liabilities	51,086	91,585
Long-term debt	1,312,158	1,267,270
Deferred purchase price obligation	514,890	0
Deferred revenue	46,959	45,486
Noncurrent accrued environmental remediation	5,764	5,764
Other noncurrent liabilities	7,440	7,268
Total liabilities	1,938,297	1,417,373
Commitments and contingencies
Common limited partner capital (66,587 units issued and outstanding at March 31, 2016 and 42,063 units issued and outstanding at December 31, 2015)	1,155,650	744,977
Subordinated limited partner capital (0 units issued and outstanding at March 31, 2016 and 24,410 units issued and outstanding at December 31, 2015)	0	213,631
General partner interests (1,355 units issued and outstanding at March 31, 2016 and December 31, 2015)	29,631	25,634
Noncontrolling interest	11,305	0
Summit Investments' equity in contributed subsidiaries	0	763,057
Total partners' capital	1,196,586	1,747,299
Total liabilities and partners' capital	$ 3,134,883	$ 3,164,672

CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares shares in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Common limited partner capital, units issued	66,587	42,063
Common limited partner capital, units outstanding	66,587	42,063
Subordinated limited partner capital, units issued	0	24,410
Subordinated limited partner capital, units outstanding	0	24,410
General partner interests, units issued	1,355	1,355
General partner interests, units outstanding	1,355	1,355

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues:
Gathering services and related fees	$ 78,100	$ 68,440
Natural gas, NGLs and condensate sales	7,588	12,613
Other revenues	4,883	5,034
Total revenues	90,571	86,087
Costs and expenses:
Cost of natural gas and NGLs	6,290	9,441
Operation and maintenance	25,842	22,791
General and administrative	12,879	11,599
Transaction costs	1,174	110
Depreciation and amortization	27,728	25,530
Gain on asset sales	(63)	0
Total costs and expenses	73,850	69,471
Other income	22	1
Interest expense	(15,882)	(14,904)
Deferred purchase price obligation expense	(7,463)	0
Loss before income taxes	(6,602)	1,713
Income tax benefit (expense)	77	(430)
Income (loss) from equity method investees	2,860	(3,768)
Net loss	(3,665)	(2,485)
Net income (loss) attributable to Summit Investments	2,745	(4,152)
Net income attributable to noncontrolling interest	44	0
Net (loss) income attributable to SMLP	(6,454)	1,667
Less net (loss) income attributable to general partner, including IDRs	1,810	1,568
Net (loss) income attributable to limited partners	(8,264)	99
Common units
Costs and expenses:
Net (loss) income attributable to limited partners	$ (8,264)	$ 69
(Loss) earnings per limited partner unit:
Basic (in dollars per share)	$ (0.12)	$ 0.00
Diluted (in dollars per share)	$ (0.12)	$ 0.00
Weighted-average limited partner units outstanding:
Basic (shares)	66,493	34,439
Diluted (shares)	66,493	34,585
Subordinated Units
Costs and expenses:
Net (loss) income attributable to limited partners		$ 30
(Loss) earnings per limited partner unit:
Basic (in dollars per share)		$ 0.00
Diluted (in dollars per share)		$ 0.00
Weighted-average limited partner units outstanding:
Basic (shares)		24,410
Diluted (shares)		24,410

CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Class B membership interest	Noncontrolling interest	Summit Investments' equity in contributed subsidiaries	Summit Investments' equity in contributed subsidiaries Class B membership interest	Limited partners, Common	Limited partners, Common Class B membership interest	Limited partners, Subordinated	General partner
Beginning balance at Dec. 31, 2014	$ 1,830,681			$ 863,792		$ 649,060		$ 293,153	$ 24,676
Increase (Decrease) in Partners' Capital [Roll Forward]
Net loss	(2,485)			(4,152)		58		41	1,568
Distributions to unitholders	(35,093)					(19,279)		(13,670)	(2,144)
Unit-based compensation	1,312	$ 251			$ 251	1,312
Tax withholdings on vested SMLP LTIP awards	(910)					(910)
Cash advance to Summit Investments from contributed subsidiaries, net	(14,468)			(14,468)
Expenses paid by Summit Investments on behalf of contributed subsidiaries	8,408			8,408
Capitalized interest allocated to contributed subsidiaries from Summit Investments	156			156
Distribution of debt related to Carve-Out Financial Statements of Summit Investments (see Notes 2 and 9)	0
Excess of consideration paid and recognized over acquired carrying value of 2016 Drop Down Assets	0
Ending balance at Mar. 31, 2015	1,787,852			853,987		630,241		279,524	24,100
Beginning balance at Dec. 31, 2015	1,747,299			763,057		744,977		213,631	25,634
Increase (Decrease) in Partners' Capital [Roll Forward]
Net loss	(3,665)		$ 44	2,745		(9,304)		1,040	1,810
Distributions to unitholders	(40,975)					(24,186)		(14,034)	(2,755)
Unit-based compensation	1,761	$ 195			$ 130	1,761	$ 65
Tax withholdings on vested SMLP LTIP awards	(786)					(786)
Cash advance to Summit Investments from contributed subsidiaries, net	12,214			12,214
Expenses paid by Summit Investments on behalf of contributed subsidiaries	4,821			4,821
Capitalized interest allocated to contributed subsidiaries from Summit Investments	223			223
Subordinated units conversion						200,637		(200,637)
Purchase of 2016 Drop Down Assets	(867,427)			(867,427)
Establishment of noncontrolling interest			11,261	(11,261)
Distribution of debt related to Carve-Out Financial Statements of Summit Investments (see Notes 2 and 9)	342,926			342,926
Excess of consideration paid and recognized over acquired carrying value of 2016 Drop Down Assets	247,428			(247,428)		242,486			4,942
Ending balance at Mar. 31, 2016	$ 1,196,586		$ 11,305	$ 0		$ 1,155,650		$ 0	$ 29,631

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (3,665)	$ (2,485)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	27,865	25,781
Amortization of deferred loan costs	905	1,108
Deferred purchase price obligation expense	7,463	0
Unit-based and noncash compensation	1,956	1,563
(Income) loss from equity method investees	(2,860)	3,768
Distributions from equity method investees	11,804	6,849
Gain on asset sales	(63)	0
Changes in operating assets and liabilities:
Accounts receivable	40,031	41,780
Trade accounts payable	(817)	(1,575)
Due to affiliate	(754)	1,054
Change in deferred revenue	1,473	3,745
Ad valorem taxes payable	(5,982)	(5,097)
Accrued interest	(9,750)	(11,125)
Accrued environmental remediation	0	(13,719)
Other, net	(757)	(3,984)
Net cash provided by operating activities	66,849	47,663
Cash flows from investing activities:
Capital expenditures	(61,326)	(49,470)
Contributions to equity method investees	(15,645)	(27,830)
Acquisitions of gathering systems from affiliate, net of acquired cash	(360,000)	(2,941)
Other, net	(377)	0
Net cash used in investing activities	(437,348)	(80,241)
Cash flows from financing activities:
Distributions to unitholders	(40,975)	(35,093)
Borrowings under revolving credit facility	424,300	89,000
Repayments under revolving credit facility	(35,300)	(26,000)
Deferred loan costs	(2,413)	(65)
Cash advance from (to) Summit Investments to (from) contributed subsidiaries, net	12,214	(14,468)
Expenses paid by Summit Investments on behalf of contributed subsidiaries	4,821	8,408
Other, net	(854)	(1,056)
Net cash provided by financing activities	361,793	20,726
Net change in cash and cash equivalents	(8,706)	(11,852)
Cash and cash equivalents, beginning of period	21,793	27,811
Cash and cash equivalents, end of period	13,087	15,959
Supplemental cash flow disclosures:
Cash interest paid	25,164	25,464
Less capitalized interest	716	527
Interest paid (net of capitalized interest)	24,448	24,937
Cash paid for taxes	0	0
Noncash investing and financing activities:
Capital expenditures in trade accounts payable (period-end accruals)	13,769	45,292
Transaction Under Common Control, Contingent Consideration Liability, Net Present Value	507,427	0
Capitalized interest allocated to contributed subsidiaries from Summit Investments	223	156
Excess of consideration paid and recognized over acquired carrying value of 2016 Drop Down Assets	247,428	0
Distribution of debt related to Carve-Out Financial Statements of Summit Investments (see Notes 2 and 9)	$ 342,926	$ 0

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION

Organization. Summit Midstream Partners, LP ("SMLP" or the "Partnership"), a Delaware limited partnership, was formed in May 2012 and began operations in October 2012 in connection with its initial public offering ("IPO") of common limited partner units. SMLP is a growth-oriented limited partnership focused on developing, owning and operating midstream energy infrastructure assets that are strategically located in the core producing areas of unconventional resource basins, primarily shale formations, in the continental United States. Our business activities are conducted through our subsidiary, Summit Midstream Holdings, LLC ("Summit Holdings"), a Delaware limited liability company, and its subsidiaries. References to the "Partnership," "we," or "our" refer collectively to SMLP and its subsidiaries.

Summit Midstream GP, LLC (the "general partner"), a Delaware limited liability company, manages our operations and activities. Summit Midstream Partners, LLC ("Summit Investments"), a Delaware limited liability company, is the ultimate owner of our general partner and has the right to appoint the entire board of directors of our general partner. Summit Investments is controlled by Energy Capital Partners II, LLC and its parallel and co-investment funds (collectively, "Energy Capital Partners" or our "Sponsor").

In addition to its 2% general partner interest in SMLP (including the incentive distribution rights ("IDRs") in respect of SMLP), Summit Investments has direct and indirect ownership interests in our common units. As of March 31, 2016, Summit Investments beneficially owned 29,854,581 SMLP common units.

Our operations are conducted through, and our operating assets are owned by, various wholly owned operating subsidiaries. Neither SMLP nor its subsidiaries have any employees. All of the personnel that conduct our business are employed by Summit Investments, but these individuals are sometimes referred to as our employees.

On February 25, 2016, the Partnership and Summit Midstream Partners Holdings, LLC (“SMP Holdings”), a wholly owned subsidiary of Summit Investments, entered into a contribution agreement (the "Contribution Agreement") pursuant to which SMP Holdings agreed to contribute to the Partnership substantially all of (i) the issued and outstanding membership interests of Summit Midstream Utica, LLC ("Summit Utica"), Meadowlark Midstream Company, LLC ("Meadowlark Midstream") and Tioga Midstream, LLC ("Tioga Midstream" and collectively with Summit Utica and Meadowlark Midstream, the "Contributed Entities"), each a limited liability company and indirect wholly owned subsidiary of SMP Holdings and (ii) SMP Holdings’ 40.0% ownership interest in each of Ohio Gathering Company, L.L.C. and Ohio Condensate Company, L.L.C. (collectively with the Contributed Entities, the “2016 Drop Down Assets”)(the “2016 Drop Down”). The 2016 Drop Down closed on March 3, 2016 (the "Initial Close"). Upon Initial Close, the Partnership held a 99.0% ownership interest in the 2016 Drop Down Assets and Summit Investments held a 1.0% noncontrolling interest.

Business Operations. We provide natural gas gathering, treating and processing services as well as crude oil and produced water gathering services pursuant to primarily long-term and fee-based agreements with our customers. Our results are driven primarily by the volumes of natural gas that we gather, treat, compress and process as well as by the volumes of crude oil and produced water that we gather. Our gathering systems and the unconventional resource basins in which they operate are as follows:


•	Summit Utica, a natural gas gathering system operating in the Appalachian Basin, which includes the Utica and Point Pleasant shale formations in southeastern Ohio;


•	Bison Midstream, LLC ("Bison Midstream"), an associated natural gas gathering system, operating in the Williston Basin, which includes the Bakken and Three Forks shale formations in northwestern North Dakota;


•	Polar Midstream, LLC ("Polar Midstream" or "Polar and Divide"), crude oil and produced water gathering systems and transmission pipelines located in the Williston Basin, which includes the Bakken and Three Forks shale formations in northwestern North Dakota;


•	Tioga Midstream, crude oil, produced water and associated natural gas gathering systems, operating in the Williston Basin, which includes the Bakken and Three Forks shale formations in northwestern North Dakota;


•	Grand River Gathering, LLC ("Grand River"), a natural gas gathering and processing system located in the Piceance Basin, which includes the Mesaverde formation and the Mancos and Niobrara shale formations in western Colorado and eastern Utah;


•	Niobrara Gathering and Processing ("Niobrara G&P"), an associated natural gas gathering and processing system operating in the Denver-Julesburg ("DJ") Basin, which includes the Niobrara and Codell shale formations in northeastern Colorado;


•	DFW Midstream Services LLC ("DFW Midstream"), a natural gas gathering system, operating in the Fort Worth Basin, which includes the Barnett Shale formation in north-central Texas; and


•	Mountaineer Midstream gathering system ("Mountaineer Midstream"), a natural gas gathering system, operating in the Appalachian Basin, which includes the Marcellus Shale formation in northern West Virginia.

Meadowlark Midstream is the legal entity which owns (i) certain crude oil and produced water gathering pipelines, which is managed and reported as part of the Polar and Divide system subsequent to the 2016 Drop Down and (ii) Niobrara G&P, which is managed and reported as part of the Grand River system subsequent to the 2016 Drop Down.

Ohio Gathering Company, L.L.C. and Ohio Condensate Company, L.L.C. (collectively, "Ohio Gathering") operate a natural gas gathering system and a condensate stabilization facility in the Appalachian Basin, which includes the Utica and Point Pleasant formations in southeastern Ohio.

Presentation and Consolidation. We prepare our unaudited condensed consolidated financial statements in accordance with accounting principles generally accepted in the United States of America ("GAAP"). These principles are established by the Financial Accounting Standards Board (the "FASB"). We make estimates and assumptions that affect the reported amounts of assets and liabilities at the balance sheet dates, including fair value measurements, the reported amounts of revenue and expense and the disclosure of contingencies. Although management believes these estimates are reasonable, actual results could differ from its estimates.

The unaudited condensed consolidated financial statements include the assets, liabilities and results of operations of SMLP and its wholly owned subsidiaries. All intercompany transactions among the consolidated entities have been eliminated in consolidation. The financial position, results of operations and cash flows of acquired drop down assets, liabilities, expenses or entities that were carved out of entities held by Summit Investments and included herein have been derived from the accounting records of the respective Summit Investments' subsidiary on a carve-out basis (see Note 2).

These unaudited condensed consolidated financial statements have been prepared pursuant to the rules and the regulations of the Securities and Exchange Commission (the "SEC"). Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations. We believe that the disclosures made are adequate to make the information not misleading. In the opinion of management, the unaudited condensed consolidated financial statements contain all adjustments, including normal recurring accruals, which are necessary to fairly present the unaudited condensed consolidated balance sheet as of March 31, 2016, the unaudited condensed consolidated statements of operations, partners' capital and cash flows for the three-month periods ended March 31, 2016 and 2015. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto that are included in our annual report on Form 10-K for the year ended December 31, 2015, as filed with the SEC on February 29, 2016 (the "2015 Annual Report"). The results of operations for an interim period are not necessarily indicative of results expected for a full year.

SMLP recognized its drop down acquisitions at Summit Investments' historical cost because the acquisitions were executed by entities under common control. The excess of Summit Investments' net investment over the purchase price paid and recognized for a contributed subsidiary is recognized as an addition to partners' capital, while the excess of purchase price paid and recognized over net investment is recognized as a reduction to partners' capital. Due to the common control aspect, we account for drop down transactions on an “as-if pooled” basis for the periods during which common control existed.

Reclassifications. In the first quarter of 2016, we adopted Accounting Standards Update ("ASU") No. 2015-03 Interest—Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs ("ASU 2015-03"). As a result, we reclassified $9.2 million of deferred loan costs from other noncurrent assets to long-term debt at December 31, 2015 (see Note 2).

In 2015, we made certain reclassifications to conform to current presentation. We evaluated our historical classification of (i) gathering fee revenue associated with certain Bison Midstream percent-of-proceeds contracts and (ii) certain pass-through expenses also for Bison Midstream. As a result of this evaluation, we determined that certain amounts that had previously been recognized in cost of natural gas and NGLs would be more appropriately reflected as gathering services and related fees and other revenues to enhance reporting transparency. The impact of these reclassifications, which had no impact on net (loss) income, total partners' capital or segment adjusted EBITDA, follows.



	Three months ended March 31, 2015
	(In thousands)
Gathering services and related fees	$	3,419
Other revenues	638
Net impact on total revenues	$	4,057

Cost of natural gas and NGLs	$	4,057
Net impact on cost of natural gas and NGLs and total costs and expenses	$	4,057

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Property, Plant, and Equipment. We record property, plant, and equipment at historical cost of construction or fair value of the assets at acquisition. We capitalize expenditures that extend the useful life of an asset or enhance its productivity or efficiency from its original design over the expected remaining period of use. For maintenance and repairs that do not add capacity or extend the useful life of an asset, we recognize expenditures as an expense as incurred. We capitalize project costs incurred during construction, including interest on funds borrowed to finance the construction of facilities, as construction in progress. To the extent that Summit Investments incurs interest expense related to capital projects of assets that have been acquired by the Partnership, the associated interest expense is allocated to the drop down assets as a noncash equity contribution and capitalized into the basis of the asset.

We record depreciation on a straight-line basis over an asset’s estimated useful life. We base our estimates for useful life on various factors including age (in the case of acquired assets), manufacturing specifications, technological advances and historical data concerning useful lives of similar assets. Estimates of useful lives follow.



	Useful lives (In years)
Gathering and processing systems and related equipment	30
Other	4-15

Construction in progress is depreciated consistent with its applicable asset class once it is placed in service. Land and line fill are not depreciated.

We base an asset’s carrying value on estimates, assumptions and judgments for useful life and salvage value. Upon sale, retirement or other disposal, we remove the carrying value of an asset and its accumulated depreciation from our balance sheet and recognize the related gain or loss, if any.

Accrued capital expenditures are reflected in trade accounts payable.

Equity Method Investments. We account for investments in which we exercise significant influence using the equity method so long as we (i) do not control the investee and (ii) are not the primary beneficiary. We recognize these investments in investment in equity method investees in the accompanying consolidated balance sheets. We recognize our proportionate share of net income or loss on a one-month lag.

We recognize an other-than-temporary impairment for losses in the value of equity method investees when evidence indicates that the carrying amount is no longer supportable. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the equity method investee to sustain an earnings capacity that would justify the carrying amount of the investment. A current fair value of an investment that is less than its carrying amount may indicate a loss in value of the investment. We evaluate our equity method investments whenever evidence exists that would indicate a need to assess the investment for potential impairment.

Other Noncurrent Assets. Other noncurrent assets primarily consist of external costs incurred in connection with the closing of our revolving credit facility and related amendments. We capitalize and then amortize these deferred loan costs over the life of the respective debt instrument. We recognize amortization of deferred loan costs in interest expense.

Deferred Purchase Price Obligation Income or Expense. We recognized a liability for the deferred purchase price obligation to reflect the expected value of the remaining consideration to be paid in 2020 for the acquisition of the 2016 Drop Down Assets. The calculation of the remaining consideration incorporates estimates of projected capital expenditures and Business Adjusted EBITDA. For balance sheet recognition purposes, we discount the remaining consideration using a commensurate risk-adjusted discount rate and recognize the change in present value in earnings in the period of change. The income or expense represents the change in present value, which comprises a time value of money concept as well as adjustments to projections and the expected value of the remaining consideration (see Note 16).

Commitments and Contingencies. We record accruals for loss contingencies when we determine that it is probable that a liability has been incurred and that such economic loss can be reasonably estimated. Such determinations are subject to interpretations of current facts and circumstances, forecasts of future events, and estimates of the financial impacts of such events. We record receivables for gain contingencies when they are realized.

Noncontrolling Interest. Noncontrolling interest represents the ownership interests of third-party entities in the net assets of our consolidated subsidiaries, including Summit Investments' ownership interest in the 2016 Drop Down Assets. For financial reporting purposes, we consolidate the 2016 Drop Down Assets with our wholly owned subsidiaries and Summit Investments' interest is shown as noncontrolling interest in partners' capital. We reflect changes in our ownership of the 2016 Drop Down Assets as adjustments to noncontrolling interest.

Earnings or Loss Per Unit ("EPU"). We determine basic EPU by dividing the net income or loss that is attributed, in accordance with the net income and loss allocation provisions of our partnership agreement, to limited partners under the two-class method, after deducting (i) the 1% noncontrolling interest in the 2016 Drop Down Assets (for periods subsequent to the 2016 Drop Down), (ii) any net income or loss of contributed subsidiaries that is attributable to Summit Investments, (iii) the general partner's 2% interest in net income or loss, and (iv) any payment of IDRs, by the weighted-average number of limited partner units outstanding. Diluted EPU reflects the potential dilution that could occur if securities or other agreements to issue common units, such as unit-based compensation, were exercised, settled or converted into common units and included in the weighted-average number of units outstanding. When it is determined that potential common units resulting from an award subject to performance or market conditions should be included in the diluted EPU calculation, the impact is reflected by applying the treasury stock method.

Comprehensive Income or Loss. Comprehensive income or loss is the same as net income or loss for all periods presented.

Environmental Matters. We are subject to various federal, state and local laws and regulations relating to the protection of the environment. Liabilities for loss contingencies, including environmental remediation costs, arising from claims, assessments, litigation, fines, and penalties and other sources are charged to expense when it is probable that a liability has been incurred and the amount of the assessment and/or remediation can be reasonably estimated. We accrue for losses associated with environmental remediation obligations when such losses are probable and reasonably estimable. Such accruals are adjusted as further information develops or circumstances change. Recoveries of environmental remediation costs from other parties or insurers are recorded as assets when their receipt is deemed probable.

Carve-Out Entities, Assets, Liabilities and Expenses. For drop down transactions involving entities that were carved out of other entities, the majority of the assets and liabilities allocated to the carve-out entity are specifically identified based on the original entity's existing divisional organization. Goodwill is allocated to the carve-out entity based on initial purchase accounting estimates. Revenues and depreciation and amortization are specifically identified based on the relationship of the carve-out entity to the original entity's existing divisional structure. Operation and maintenance and general and administrative expenses are allocated to the carve-out entity based on volume throughput.

For drop down transactions involving assets, liabilities and expenses that were carved out of other entities, the majority of the assets and liabilities allocated to the carve-out are specifically identified based on the original entity's existing divisional organization. Depreciation and amortization are specifically identified based on the relationship of the carve-out entity to the original entity's existing divisional structure. General and administrative expenses are allocated to the carve-out entity based on an allocation of Summit Investments' consolidated expenses.

Allocation of Certain Liabilities in Drop Downs. For drop down transactions involving assets for which their development was funded with parent company debt which was replaced with bank borrowings or debt capital at the Partnership, we allocate a portion of that debt, net of deferred loan costs, to the drop down assets during the common control period. Interest expense is allocated and recognized during the common control period. Any outstanding debt balance or principal is included in the calculation of the excess or deficit of acquired carrying value over consideration paid and recognized.

Recent Accounting Pronouncements. Accounting standard setters frequently issue new or revised accounting rules. We review new pronouncements to determine the impact, if any, on our financial statements. Accounting standards that have or could possibly have a material effect on our financial statements are discussed below.

Recently Adopted Accounting Pronouncements. In April 2015, the FASB issued ASU 2015-03. Under ASU 2015-03, entities that have historically presented debt issuance costs as an asset, related to a recognized debt liability, will be required to present those costs as a direct deduction from the carrying amount of that debt liability. In August 2015, the FASB amended ASU 2015-03 to address the presentation and subsequent measurement of debt issuance costs related to line of credit (“LOC”) arrangements. The amendment permits an entity to defer and present debt issuance costs as an asset and subsequently amortize deferred debt issuance costs ratably over the term of a LOC arrangement, regardless of whether there are outstanding borrowings under that LOC arrangement. This new standard is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015. The January 2016 adoption of this update resulted in a reclassification from other noncurrent assets to long-term debt of the debt issuance costs associated with our senior notes (see Note 9). Debt issuance costs associated with the Partnership's revolving credit facility will remain in other noncurrent assets. This standard had no impact on interest expense, net income or loss, EPU or partners' capital.

Accounting Pronouncements Pending Adoption. We are currently in the process of evaluating the applicability and/or impact of the following accounting pronouncements:


•	ASU No. 2014-09 Revenue From Contracts With Customers (Topic 606) ("ASU 2014-09"). There has been no to our position regarding ASU 2014-09 during the first quarter of 2016. See Note 2 to the consolidated financial statements included in the 2015 Annual Report for additional information.

•

ASU No. 2016-02 Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 requires that lessees recognize all leases on the balance sheet, with the exception of short-term leases. A lease liability will be recorded for the obligation of a lessee to make lease payments arising from a lease. A right-of-use asset, will be recorded which represents the lessee’s right to use, or to control the use of, a specified asset for a lease term. Under the new guidance, lessor accounting is largely unchanged. ASU 2016-02 is effective for public companies for fiscal years beginning after December 15, 2019, and requires the modified retrospective approach for transition.


•	ASU No. 2016-08 Revenue From Contracts With Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU No. 2016-08"). ASU No. 2016-08 does not change the core principle of Topic 606, rather it clarifies the implementation guidance on principal versus agent considerations. The effective date and transition for this update are the same as ASU 2014-09.

•

ASU No. 2016-09 Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). ASU 2016-09 simplifies several aspects for share-based payment award transactions, including income tax consequences, the liability or equity classification of awards and classification on the statement of cash flows. ASU 2016-09 is effective for public companies for fiscal years beginning after December 15, 2016. It does not specify a single transition approach, rather it specifies retrospective, modified retrospective and/or prospective transition approaches based on the aspect being applied.

•

ASU No. 2016-10 Revenue From Contracts With Customers (Topic 606): Identifying Performance Obligations and Licensing ("ASU No. 2016-10"). ASU No. 2016-10 clarifies the following two aspects of Topic 606 (i) identifying performance obligations and (ii) the licensing implementation guidance, while retaining the related principles for those areas. The effective date and transition for this update are the same as ASU 2014-09.

Recent accounting guidance not discussed above is not applicable, did not have, or is not expected to have a material impact on our financial statements. For additional information on new accounting pronouncements and recent accounting guidance and their impact, if any, on our financial position or results of operations, see Note 2 of the notes to the consolidated financial statements included in the 2015 Annual Report.

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Segment Information

SEGMENT INFORMATION

As of March 31, 2016, our reportable segments are:


•	the Utica Shale, which includes our ownership interest in Ohio Gathering and also is served by Summit Utica;


•	the Williston Basin, which is served by Bison Midstream, Polar and Divide and Tioga Midstream;


•	the Piceance/DJ Basins, which is served by Grand River and Niobrara G&P;


•	the Barnett Shale, which is served by DFW Midstream; and


•	the Marcellus Shale, which is served by Mountaineer Midstream.

Each of our reportable segments provides midstream services in a specific geographic area. Our reportable segments reflect the way in which we internally report the financial information used to make decisions and allocate resources in connection with our operations.

As noted above, our investment in Ohio Gathering is included in the Utica Shale reportable segment. Segment assets for the Utica Shale includes the associated investment in equity method investees. Income or loss from equity method investees, as reflected on the statements of operations, solely relates to Ohio Gathering and is recognized and disclosed on a one-month lag (see Note 7). No other line items in the statements of operations or cash flows, as disclosed in the tables below, include results for our investment in Ohio.

Corporate represents those assets and liabilities and revenues and expenses that are not specifically attributable to a reportable segment, not individually reportable, or that have not been allocated to our reportable segments.

Assets by reportable segment follow.



	March 31, 2016		December 31, 2015
	(In thousands)
Assets:
Utica Shale (1)	$	922,717	$	886,223
Williston Basin	725,641		740,361
Piceance/DJ Basins	829,608		866,095
Barnett Shale	411,118		416,586
Marcellus Shale	232,017		233,116
Total reportable segment assets	3,121,101		3,142,381
Corporate	13,782		22,291
Total assets	$	3,134,883	$	3,164,672

__________

(1) Represents the investment in equity method investees for Ohio Gathering (see Note 7) and total assets for Summit Utica.

Revenues by reportable segment follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Revenues:
Utica Shale	$	4,283	$	389
Williston Basin	30,008		23,066
Piceance/DJ Basins	28,993		30,894
Barnett Shale	20,402		23,897
Marcellus Shale	6,885		7,841
Total reportable segment revenues and total revenues	$	90,571	$	86,087

Counterparties accounting for more than 10% of total revenues were as follows:



	Three months ended March 31,
	2016	2015
Percentage of total revenues:
Counterparty A - Piceance/DJ Basins	*	13	%

__________

* Less than 10%

Depreciation and amortization, including the amortization expense associated with our favorable and unfavorable gas gathering contracts as reported in other revenues, by reportable segment follows.



	Three months ended March 31,
	2016		2015
	(In thousands)
Depreciation and amortization:
Utica Shale	$	844	$	139
Williston Basin	8,357		7,368
Piceance/DJ Basins	12,273		11,783
Barnett Shale	4,056		4,157
Marcellus Shale	2,219		2,168
Total reportable segment depreciation and amortization	27,749		25,615
Corporate	116		166
Total depreciation and amortization	$	27,865	$	25,781

Capital expenditures by reportable segment follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Capital expenditures:
Utica Shale	$	34,988	$	22,565
Williston Basin	18,034		18,310
Piceance/DJ Basins	5,824		6,808
Barnett Shale	563		893
Marcellus Shale	1,738		496
Total reportable segment capital expenditures	61,147		49,072
Corporate	179		398
Total capital expenditures	$	61,326	$	49,470

We assess the performance of our reportable segments based on segment adjusted EBITDA. We define segment adjusted EBITDA as total revenues less total costs and expenses; plus (i) other income excluding interest income, (ii) our proportional adjusted EBITDA for equity method investees, (iii) depreciation and amortization, (iv) adjustments related to MVC shortfall payments, (v) impairments and (vi) other noncash expenses or losses, less other noncash income or gains. We define proportional adjusted EBITDA for our equity method investees as the product of total revenues less total expenses, plus amortization for deferred contract costs multiplied by our ownership interest in Ohio Gathering during the respective period.

Segment adjusted EBITDA by reportable segment follows.



	Three months ended March 31,
	2016		2015
	(In thousands)
Reportable segment adjusted EBITDA:
Utica Shale (1)	$	15,577	$	5,206
Williston Basin	19,719		10,975
Piceance/DJ Basins	24,817		28,702
Barnett Shale	14,077		16,760
Marcellus Shale	4,600		6,536
Total reportable segment adjusted EBITDA	$	78,790	$	68,179

__________

(1) Includes our proportional share of adjusted EBITDA for Ohio Gathering and is reflected as the proportional adjusted EBITDA for equity method investees in the reconciliation of income or loss before income taxes to segment adjusted EBITDA.

A reconciliation of loss before income taxes to total reportable segment adjusted EBITDA follows.



	Three months ended March 31,
	2016			2015
	(In thousands)
Reconciliation of Loss Before Income Taxes to Segment Adjusted EBITDA:
Loss before income taxes	$	(6,602	)	$	1,713
Add:
Allocated corporate expenses	8,781			6,623
Interest expense	15,882			14,904
Deferred purchase price obligation expense	7,463			—
Depreciation and amortization	27,865			25,781
Proportional adjusted EBITDA for equity method investees	12,388			5,263
Adjustments related to MVC shortfall payments	11,142			12,333
Unit-based and noncash compensation	1,956			1,563
Loss on asset sales	—			—
Less:
Interest income	22			1
Gain on asset sales	63			—
Total reportable segment adjusted EBITDA	$	78,790		$	68,179

Segment adjusted EBITDA excludes the effect of allocated corporate expenses, such as certain general and administrative expenses (including compensation-related expenses and professional services fees), transaction costs, interest expense, deferred purchase price obligation income or expense and income tax expense.

Adjustments related to MVC shortfall payments account for:


•	the net increases or decreases in deferred revenue for MVC shortfall payments and


•	our inclusion of expected annual MVC shortfall payments. We include a proportional amount of these historical or expected MVC shortfall payments in each quarter prior to the quarter in which we actually recognize the shortfall payment. These adjustments have not been billed to our customers and are not recognized in our unaudited condensed consolidated financial statements.

Adjustments related to MVC shortfall payments by reportable segment follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Adjustments related to MVC shortfall payments:
Williston Basin	$	3,536	$	2,653
Piceance/DJ Basins	7,517		9,903
Barnett Shale	89		(223		)
Total adjustments related to MVC shortfall payments	$	11,142	$	12,333

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9031-108599

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9054-108599

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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

+ Details

PROPERTY, PLANT, AND EQUIPMENT, NET

3 Months Ended

Mar. 31, 2016

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT, AND EQUIPMENT, NET

Details on property, plant, and equipment follow.



	March 31, 2016		December 31, 2015
	(In thousands)
Gathering and processing systems and related equipment	$	1,918,080	$	1,883,139
Construction in progress	77,596		75,132
Land and line fill	11,436		11,055
Other	32,931		32,427
Total	2,040,043		2,001,753
Less accumulated depreciation	206,278		188,970
Property, plant, and equipment, net	$	1,833,765	$	1,812,783

Depreciation expense and capitalized interest follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Depreciation expense	$	17,370	$	15,264
Capitalized interest	716		527

AMORTIZING INTANGIBLE ASSETS AND UNFAVORABLE GAS GATHERING CONTRACT

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

AMORTIZING INTANGIBLE ASSETS AND LIABILITIES AND UNFAVORABLE GAS GATHERING CONTRACT

AMORTIZING INTANGIBLE ASSETS AND UNFAVORABLE GAS GATHERING CONTRACT

Details regarding our intangible assets and the unfavorable gas gathering contract (included in other noncurrent liabilities), all of which are subject to amortization, follow.



	March 31, 2016
	Useful lives (In years)	Gross carrying amount		Accumulated amortization			Net

		(Dollars in thousands)
Favorable gas gathering contracts	18.7	$	24,195	$	(9,872	)	$	14,323
Contract intangibles	12.5	426,464		(119,906		)	306,558
Rights-of-way	26.1	152,195		(20,409		)	131,786
Total intangible assets		$	602,854	$	(150,187	)	$	452,667

Unfavorable gas gathering contract	10.0	$	10,962	$	(6,278	)	$	4,684



	December 31, 2015
	Useful lives (In years)	Gross carrying amount		Accumulated amortization			Net

		(Dollars in thousands)
Favorable gas gathering contracts	18.7	$	24,195	$	(9,534	)	$	14,661
Contract intangibles	12.5	426,464		(111,052		)	315,412
Rights-of-way	26.3	150,143		(18,906		)	131,237
Total intangible assets		$	600,802	$	(139,492	)	$	461,310

Unfavorable gas gathering contract	10.0	$	10,962	$	(6,077	)	$	4,885

We recognized amortization expense in other revenues as follows:



	Three months ended March 31,
	2016			2015

	(In thousands)
Amortization expense – favorable gas gathering contracts	$	(338	)	$	(426	)
Amortization expense – unfavorable gas gathering contract	201			175

We recognized amortization expense in costs and expenses as follows:



	Three months ended March 31,
	2016		2015

	(In thousands)
Amortization expense – contract intangibles	$	8,854	$	8,835
Amortization expense – rights-of-way	1,503		1,431

The estimated aggregate annual amortization expected to be recognized for the remainder of 2016 and each of the four succeeding fiscal years follows.



	Intangible assets		Unfavorable gas gathering contract

	(In thousands)
2016	$	32,500	$	729
2017	42,028		1,047
2018	41,482		1,035
2019	41,727		1,045
2020	44,373		828

GOODWILL	3 Months Ended
GOODWILL	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL We evaluate goodwill for impairment annually on September 30 and whenever events or circumstances indicate that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. There have been no impairments of goodwill during the three months ended March 31, 2016. Fourth Quarter 2015 Goodwill Impairment. In the first quarter of 2016, we finalized our calculations of the fair values of the identified assets and liabilities in step two of the December 31, 2015 goodwill impairment testing for the Grand River and Polar and Divide reporting units. This process confirmed the preliminary goodwill impairments of $45.5 million for Grand River and $203.4 million for Polar and Divide that were recognized as of December 31, 2015. Fair Value Measurement. Our impairment determinations, in the context of (i) our annual impairment evaluations and (ii) our other-than-annual impairment evaluations involved significant assumptions and judgments, as discussed in the 2015 Annual Report. Differing assumptions regarding any of these inputs could have a significant effect on the various valuations. As such, the fair value measurements utilized within these models are classified as non-recurring Level 3 measurements in the fair value hierarchy because they are not observable from objective sources. Due to the volatility of the inputs used, we cannot predict the likelihood of any future impairment.

EQUITY METHOD INVESTMENTS

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

EQUITY METHOD INVESTMENTS

Ohio Gathering owns, operates and is currently developing midstream infrastructure consisting of a liquids-rich natural gas gathering system, a dry natural gas gathering system and a condensate stabilization facility in the Utica Shale Play in southeastern Ohio. Ohio Gathering provides gathering services pursuant to primarily long-term, fee-based gathering agreements, which include acreage dedications.

In January 2014, Summit Investments acquired a 1.0% ownership interest in Ohio Gathering from Blackhawk Midstream, LLC ("Blackhawk") for $190.0 million. Concurrent with this acquisition, Summit Investments made an $8.4 million capital contribution to Ohio Gathering to maintain its 1.0% ownership interest.

The ownership interest Summit Investments acquired from Blackhawk included an option to increase the holder's ownership interest in Ohio Gathering to 40.0% (the "Option"). In May 2014, Summit Investments exercised the Option to increase its ownership to 40.0% (the "Option Exercise") and made the following payments (i) $326.6 million of capital contribution true-ups, (ii) $50.4 million of additional capital contributions to maintain its 40.0% ownership interest, and (iii) $5.1 million of management fee payments that were recognized as capital contributions in its Ohio Gathering capital accounts. Concurrent with and subsequent to the Option Exercise, the non-affiliated owners have retained their respective 60.0% ownership interest in Ohio Gathering (the "Non-affiliated Owners").

Summit Investments accounted for its initial ownership interests in Ohio Gathering under the cost method due to its ownership percentage and because it determined that it was not the primary beneficiary. Subsequent to the Option Exercise, Summit Investments accounted for its ownership interests in Ohio Gathering as equity method investments because it had joint control with the Non-affiliated Owners, which gave it significant influence. This shift from the cost method to the equity method required that Summit Investments retrospectively reflect its investment in Ohio Gathering and the associated results of operations as if it had been utilizing the equity method since the inception of its investment.

Summit Investments recognized the $190.0 million that it paid to Blackhawk as an investment in Ohio Gathering at inception. In addition, Ohio Gathering had assigned a value of $7.5 million to the Option, recognized it initially as an asset and concurrently attributed the value of the Option to Blackhawk's capital account. Upon acquiring Blackhawk's interest, the Option was reclassified from Blackhawk's capital account to Summit Investments' capital account in Ohio Gathering's records. Neither of these transactions involved a flow of funds to or from Ohio Gathering. As such, they created a basis difference between its recorded investment in equity method investees and that recognized and attributed to Summit Investments by Ohio Gathering. In accordance with the retrospective recognition triggered by the Option Exercise, in February 2014, Summit Investments began amortizing these basis differences over the weighted-average remaining life of the contracts underlying Ohio Gathering's operations. The impact of amortizing these two basis differences will result in a net decrease to its investment in equity method investees.

Subsequent to the Option Exercise, Summit Investments continued to make capital contributions to Ohio Gathering along with receiving distributions such that it maintained its 40.0% ownership interest through the 2016 Drop Down, at which point SMLP began making contributions and receiving distributions such that it maintained its 40.0% ownership interest through March 31, 2016.

A rollforward of the investment in equity method investees follows.



	2016			2015
	(In thousands)
Investment in equity method investees, January 1	$	751,168		$	706,172
Cash contributions	15,645			27,830
Cash distributions	(11,804		)	(6,849		)
Income (loss) from equity method investees	6,198			(430		)
Amortization of basis difference in equity method investees	(3,338		)	(3,338		)
Investment in equity method investees, March 31	757,869			723,385
March cash contributions	(4,291		)	—
March cash distributions	4,816			1,884
Basis difference	(153,551		)	(166,903		)
Investment in equity method investees, net of basis difference, February 29, 2016 and February 28, 2015	$	604,843		$	558,366

The following table presents summarized balance sheet information for Ohio Gathering.



	February 29, 2016		February 28, 2015
	(In thousands)
Total assets	$	1,513,668	$	1,427,142
Total liabilities	45,176		74,674
Members' equity	1,468,492		1,352,468

The following table presents summarized statements of operations information for Ohio Gathering for the three-month periods ended February 29, 2016 and February 28, 2015.



	Three months ended February 29, 2016		Three months ended February 28, 2015
	(In thousands)
Total revenues	$	42,997	$	23,680
Total operating expenses	27,092		24,757
Net income (loss)	15,725		(1,077		)

DEFERRED REVENUE

3 Months Ended

Mar. 31, 2016

Deferred Revenue Disclosure [Abstract]

Deferred Revenue

DEFERRED REVENUE

A rollforward of current deferred revenue follows.



	Williston Basin		Barnett Shale		Piceance/DJ Basins			Total current
	(In thousands)
Current deferred revenue, January 1, 2016	$	—	$	677	$	—		$	677
Additions	—		—		2,722			2,722
Less revenue recognized	—		—		(2,722		)	(2,722		)
Current deferred revenue, March 31, 2016	$	—	$	677	$	—		$	677

A rollforward of noncurrent deferred revenue follows.



	Williston Basin		Barnett Shale		Piceance/DJ Basins		Total noncurrent
	(In thousands)
Noncurrent deferred revenue, January 1, 2016	$	29,002	$	—	$	16,484	$	45,486
Additions	235		—		1,238		1,473
Less revenue recognized	—		—		—		—
Noncurrent deferred revenue, March 31, 2016	$	29,237	$	—	$	17,722	$	46,959

As of March 31, 2016, accounts receivable included $1.6 million of shortfall billings related to MVC arrangements that can be utilized to offset gathering fees in subsequent periods.

- Definition

The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

DEBT

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

DEBT

Debt consisted of the following:



	March 31, 2016			December 31, 2015
	(In thousands)
Summit Holdings variable rate senior secured revolving credit facility (3.19% at March 31, 2016 and 2.93% at December 31, 2015) due November 2018	$	721,000		$	344,000
SMP Holdings variable rate senior secured revolving credit facility (2.43% at December 31, 2015) (1)	—			115,000
SMP Holdings variable rate senior secured term loan (2.43% at December 31, 2015) (1)	—			217,500
Summit Holdings 5.50% Senior unsecured notes due August 2022	300,000			300,000
less unamortized deferred loan costs (2)	(3,981		)	(4,139		)
Summit Holdings 7.50% Senior unsecured notes due July 2021	300,000			300,000
less unamortized deferred loan costs (2)	(4,861		)	(5,091		)
Total long-term debt	$	1,312,158		$	1,267,270

__________

(1) Debt was allocated to the 2016 Drop Down Assets prior to the closing of the 2016 Drop Down but was retained by Summit Investments after close.

(2) Issuance costs are being amortized over the life of the notes.

Revolving Credit Facility. We have a senior secured revolving credit facility which allows for revolving loans, letters of credit and swingline loans (the "revolving credit facility"). On February 25, 2016, we closed on an amendment to the revolving credit facility, which became effective concurrent with the Initial Close of the 2016 Drop Down. In connection with this amendment, (i) the revolving credit facility's borrowing capacity increased from $700.0 million to $1.25 billion, (ii) a new investment basket allowing the Co-Issuers (as defined below) to buy back up to $100.0 million of our outstanding senior unsecured notes was included (iii) the total leverage ratio was increased to 5.50 to 1.0 through December 31, 2016 and (iv) various amendments were approved to facilitate the 2016 Drop Down. The revolving credit facility matures in November 2018 and includes a $200.0 million accordion feature. It is secured by the membership interests of Summit Holdings and those of its subsidiaries. Substantially all of Summit Holdings' and its subsidiaries' assets are pledged as collateral under the revolving credit facility. The revolving credit facility, and Summit Holdings' obligations, are guaranteed by SMLP and each of its subsidiaries.

Borrowings under the revolving credit facility bear interest at the London Interbank Offered Rate ("LIBOR") or an Alternate Base Rate ("ABR") plus an applicable margin ranging from 0.75% to 1.75% for ABR borrowings and 1.75% to 2.75% for LIBOR borrowings, with the commitment fee ranging from 0.30% to 0.50% in each case based on our relative leverage at the time of determination. At March 31, 2016, the applicable margin under LIBOR borrowings was 2.75%, the interest rate was 3.19% and the unused portion of the revolving credit facility totaled $529.0 million (subject to a commitment fee of 0.50%).

The revolving credit agreement contains affirmative and negative covenants customary for credit facilities of its size and nature that, among other things, limit or restrict the ability to: (i) incur additional debt; (ii) make investments; (iii) engage in certain mergers, consolidations, acquisitions or sales of assets; (iv) enter into swap agreements and power purchase agreements; (v) enter into leases that would cumulatively obligate payments in excess of $30.0 million over any 12-month period; and (vi) prohibits the payment of distributions by Summit Holdings if a default then exists or would result therefrom, and otherwise limits the amount of distributions Summit Holdings can make. In addition, the revolving credit facility requires Summit Holdings to maintain a ratio of consolidated trailing 12-month earnings before interest, income taxes, depreciation and amortization ("EBITDA," as defined in the credit agreement) to net interest expense of not less than 2.5 to 1.0 (as defined in the credit agreement) and a ratio of total net indebtedness to consolidated trailing 12-month EBITDA of not more than 5.0 to 1.0, or not more than 5.5 to 1.0 for up to 270 days following certain acquisitions. Additionally, the total leverage ratio upper limit can be increased from 5.0 to 1.0 to 5.5 to 1.0 at our option, subject to the inclusion of a senior secured leverage ratio (senior secured net indebtedness to consolidated trailing 12-month EBITDA, as defined in the credit agreement) upper limit of 3.75 to 1.0.

As of March 31, 2016, we were in compliance with the revolving credit facility's covenants. There were no defaults or events of default during the three months ended March 31, 2016.

Senior Notes. In July 2014, Summit Holdings and its 100% owned finance subsidiary, Summit Midstream Finance Corp. ("Finance Corp.," together with Summit Holdings, the "Co-Issuers"), co-issued $300.0 million of 5.50% senior unsecured notes maturing August 15, 2022 (the "5.5% senior notes"). In June 2013, the Co-Issuers co-issued $300.0 million of 7.50% senior unsecured notes maturing July 1, 2021 (the "7.5% senior notes").

SMLP and all of its subsidiaries other than the Co-Issuers (the "Guarantors") have fully and unconditionally and jointly and severally guaranteed the 5.5% senior notes and the 7.5% senior notes. SMLP has no independent assets or operations. Summit Holdings has no assets or operations other than its ownership of its wholly owned subsidiaries and activities associated with its borrowings under the revolving credit facility, the 5.5% senior notes and the 7.5% senior notes. Finance Corp. has no independent assets or operations and was formed for the sole purpose of being a co-issuer of certain of Summit Holdings' indebtedness, including the 5.5% senior notes and the 7.5% senior notes. There are no significant restrictions on the ability of SMLP or Summit Holdings to obtain funds from its subsidiaries by dividend or loan.

As of March 31, 2016, we were in compliance with the covenants of the 5.5% senior notes and the 7.5% senior notes. There were no defaults or events of default during the three months ended March 31, 2016.

FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

FINANCIAL INSTRUMENTS

Concentrations of Credit Risk. Financial instruments that potentially subject us to concentrations of credit risk consist of cash and accounts receivable. We maintain our cash in bank deposit accounts that frequently exceed federally insured limits. We have not experienced any losses in such accounts and do not believe we are exposed to any significant risk.

Accounts receivable primarily comprise amounts due for the gathering, treating and processing services we provide to our customers and also the sale of natural gas liquids ("NGLs") resulting from our processing services. This industry concentration has the potential to impact our overall exposure to credit risk, either positively or negatively, in that our customers may be similarly affected by changes in economic, industry or other conditions. We monitor the creditworthiness of our counterparties and can require letters of credit for receivables from counterparties that are judged to have substandard credit, unless the credit risk can otherwise be mitigated. Our top five customers or counterparties accounted for 49% of total accounts receivable at March 31, 2016, compared with 68% as of December 31, 2015.

Fair Value. The carrying amount of cash and cash equivalents, accounts receivable and trade accounts payable reported on the balance sheet approximates fair value due to their short-term maturities.

The deferred purchase price obligation's carrying value is its fair value because carrying value represents the present value of the payment expected to be made in 2020 (see Note 16 for additional information). Our calculation of the present value of the expected cash payment for the 2016 Drop Down Assets involved significant assumptions and judgments. Differing assumptions regarding any of these inputs could have a material effect on the cash payment and its present value. As such, its fair value measurement is classified as a non-recurring Level 3 measurement in the fair value hierarchy because our assumptions and judgments are not observable from objective sources (see Note 16).

The roll-forward of the Level 3 liabilities measured at fair value on a recurring basis follows.



	Three months ended March 31, 2016		Three months ended March 31, 2015
	(In thousands)
Level 3 liabilities, beginning of period	$	—	$	—
Additions	507,427		—
Change in fair value	7,463		—
Level 3 liabilities, end of period	$	514,890	$	—

A summary of the estimated fair value of our debt financial instruments follows.



	March 31, 2016				December 31, 2015
	Carrying value		Estimated fair value (1)		Carrying value		Estimated fair value (1)
	(In thousands)
Summit Holdings revolving credit facility	$	721,000	$	721,000	$	344,000	$	344,000
SMP Holdings revolving credit facility (2)	—		—		115,000		115,000
SMP Holdings term loan (2)	—		—		217,500		217,500
5.5% Senior notes ($300.0 million principal)	296,019		213,000		295,861		224,000
7.5% Senior notes ($300.0 million principal)	295,139		237,750		294,909		257,000

__________

(1) All estimated fair value calculations are Level 2.

(2) Debt was allocated to the 2016 Drop Down Assets prior to the closing of the 2016 Drop Down but was retained by Summit Investments after close.

The outstanding balance on the revolving credit facility is its fair value due to its floating interest rate. The fair value for the senior notes is based on an average of nonbinding broker quotes as of March 31, 2016 and December 31, 2015. The use of different market assumptions or valuation methodologies may have a material effect on the estimated fair value of the senior notes.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

PARTNERS' CAPITAL

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

PARTNERS' CAPITAL

A rollforward of the number of common limited partner, subordinated limited partner and general partner units follows.



	Common	Subordinated		General partner	Total
Units, January 1, 2016	42,062,644	24,409,850		1,354,700	67,827,194
Net units issued under SMLP LTIP	114,741	—		—	114,741
Subordinated unit conversion	24,409,850	(24,409,850	)	—	—
Units, March 31, 2016	66,587,235	—		1,354,700	67,941,935

Subordination. Prior to the end of the subordination period, the principal difference between our common units and subordinated units was that holders of the subordinated units were not entitled to receive any distribution of available cash until the common units had received the minimum quarterly distribution ("MQD") plus any arrearages in the payment of the MQD from prior quarters. The subordination period ended in conjunction with the February 2016 distribution payment in respect of the fourth quarter of 2015 and the then-outstanding subordinated units converted to common units on a one-for-one basis.

Noncontrolling Interest. We have recorded Summit Investments' retained ownership interest in the 2016 Drop Down Assets as a noncontrolling interest in the consolidated financial statements.

Summit Investments' Equity in Contributed Subsidiaries. Summit Investments' equity in contributed subsidiaries represents its position in the net assets of the 2016 Drop Down Assets and Polar and Divide that have been acquired by SMLP. The balance also reflects net income or loss attributable to Summit Investments for the 2016 Drop Down Assets and Polar and Divide for the periods beginning on the dates they were acquired or formed by Summit Investments and ending on the dates they were acquired by the Partnership. During the three months ended March 31, 2016 and 2015, net income or loss was attributed to Summit Investments for:


•	the 2016 Drop Down Assets for the period from January 1, 2015 to March 3, 2016 and


•	Polar and Divide for the period from January 1, 2015 to May 18, 2015.

Although included in partners' capital, any net income or loss attributable to Summit Investments is excluded from the calculation of EPU.

2016 Drop Down. On March 3, 2016, we acquired the 2016 Drop Down Assets from a subsidiary of Summit Investments. We paid cash consideration of $360.0 million and recognized a deferred purchase price obligation of $507.4 million in exchange for Summit Investments' $1.11 billion net investment in the 2016 Drop Down Assets (see Note 15). We recognized a capital contribution from Summit Investments for the difference between (i) the cash consideration paid and the deferred purchase price obligation and (ii) Summit Investments' net investment in the 2016 Drop Down Assets.

The calculation of the capital distribution and its allocation to partners' capital follows (in thousands).



Summit Investments' net investment in the 2016 Drop Down Assets	$	771,929
SMP Holdings borrowings allocated to 2016 Drop Down Assets and retained by Summit Investments	342,926
Acquired carrying value of 2016 Drop Down Assets			$	1,114,855

Deferred purchase price obligation	$	507,427
Borrowings under revolving credit facility	360,000
Total consideration paid and recognized by SMLP			867,427
Excess of acquired carrying value over consideration paid and recognized			$	247,428

Allocation of capital contribution:
General partner interest	$	4,942
Common limited partner interest	242,486
Partners' capital contribution – excess of acquired carrying value over consideration paid and recognized			$	247,428

Cash Distributions Paid and Declared. We paid the following per-unit distributions during the three months ended March 31:



	Three months ended March 31,
	2016		2015
Per-unit distributions to unitholders	$	0.575	$	0.560

On April 21, 2016, the board of directors of our general partner declared a distribution of $0.575 per unit for the quarterly period ended March 31, 2016. This distribution, which totaled $41.0 million, will be paid on May 13, 2016 to unitholders of record at the close of business on May 6, 2016. We allocated the May 2016 distribution using a 25% marginal percentage interest in accordance with the third target distribution level.

Incentive Distribution Rights. Our general partner also currently holds IDRs that entitle it to receive increasing percentage allocations, up to a maximum of 50.0%, of the cash we distribute from operating surplus in excess of $0.46 per unit per quarter. Our payment of IDRs as reported in distributions to unitholders – general partner in the statement of partners' capital during the three months ended March 31 follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
IDR payments	$	1,935	$	1,442

For the purposes of calculating net income or loss attributable to general partner, the financial impact of IDRs is recognized in respect of the quarter for which the distributions were declared. For the purposes of calculating distributions to unitholders in the statements of partners' capital and cash flows, IDR payments are recognized in the quarter in which they are paid.

EARNINGS PER UNIT

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

EARNINGS PER UNIT

The following table details the components of EPU.



	Three months ended March 31,
	2016			2015
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net (loss) income among limited partner interests:
Net (loss) income attributable to common units	$	(8,264	)	$	69
Net income attributable to subordinated units (1)				30
Net (loss) income attributable to limited partners	$	(8,264	)	$	99

Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	66,493			34,439
Effect of nonvested phantom units	—			146
Weighted-average common units outstanding – diluted	66,493			34,585

Weighted-average subordinated units outstanding – basic and diluted (1)				24,410

(Loss) earnings per limited partner unit:
Common unit – basic	$	(0.12	)	$	0.00
Common unit – diluted	$	(0.12	)	$	0.00
Subordinated unit – basic and diluted (1)				$	0.00

__________

(1) The subordinated units converted to common units on a one-for-one basis in February 2016 (see Note 11).

During the three months ended March 31, 2016 and 2015, we excluded 496,959 and 8,524 nonvested phantom units, respectively, in our calculation of diluted EPU because they were anti-dilutive.

UNIT-BASED AND NONCASH COMPENSATION

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

UNIT-BASED AND NONCASH COMPENSATION

SMLP Long-Term Incentive Plan. The SMLP Long-Term Incentive Plan (the "SMLP LTIP") provides for equity awards to eligible officers, employees, consultants and directors of our general partner and its affiliates. Items to note:


•	In March 2016, we granted 488,482 phantom units to employees in connection with our annual incentive compensation award cycle. These awards had a grant date fair value of $14.82 and vest ratably over a three-year period.


•	Also in March 2016, 120,920 phantom units vested.


•	As of March 31, 2016, approximately 3.9 million common units remained available for future issuance.

SMP Net Profits Interests. In connection with the formation of Summit Investments, up to 7.5% of total membership interests were authorized for issuance (the "SMP Net Profits Interests"). These membership interests were not contributed to SMLP in connection with its IPO. The expense associated with the SMP Net Profits Interests was allocated to Summit Investments' subsidiaries other than SMLP and its subsidiaries after the IPO. In connection with our acquisitions of the 2016 Drop Down Assets and Polar and Divide, we recognized the SMP Net Profits Interests' noncash compensation expense that had been allocated to the contributed subsidiaries prior to their respective drop down date due to common control.

Noncash compensation recognized in general and administrative expense related to the SMP Net Profits Interests was as follows:



	Three months ended March 31,
	2016		2015
	(In thousands)
SMP Net Profits Interests noncash compensation	$	195	$	251

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

RELATED-PARTY TRANSACTIONS

3 Months Ended

Mar. 31, 2016

RELATED-PARTY TRANSACTIONS

Acquisitions. See Notes 1, 9, 11 and 16 for disclosure of the 2016 Drop Down and its funding.

Reimbursement of Expenses from General Partner. Our general partner and its affiliates do not receive a management fee or other compensation in connection with the management of our business, but will be reimbursed for expenses incurred on our behalf. Under our partnership agreement, we reimburse our general partner and its affiliates for certain expenses incurred on our behalf, including, without limitation, salary, bonus, incentive compensation and other amounts paid to our general partner's employees and executive officers who perform services necessary to run our business. Our partnership agreement provides that our general partner will determine in good faith the expenses that are allocable to us. Due to affiliate on the consolidated balance sheet represents the payables to our general partner for expenses incurred by it and paid on our behalf.

Expenses incurred by the general partner and reimbursed by us under our partnership agreement were as follows:



	Three months ended March 31,
	2016		2015
	(In thousands)
Operation and maintenance expense	$	6,749	$	6,474
General and administrative expense	7,778		7,135

Expenses Incurred by Summit Investments. Prior to the 2016 Drop Down and the Polar and Divide Drop Down, Summit Investments incurred:


•	certain support expenses and capital expenditures on behalf of the contributed subsidiaries. These transactions were settled periodically through membership interests prior to the respective drop down;


•	interest expense that was related to capital projects for the contributed subsidiaries. As such, the associated interest expense was allocated to the respective contributed subsidiary's capital projects as a noncash contribution and capitalized into the basis of the asset; and


•	noncash compensation expense for the SMP Net Profits Interests, which were accounted for as compensatory awards. As such, the annual expense associated with the SMP Net Profits was allocated to the respective contributed subsidiary.

Subsequent to any drop down, these expenses are retrospectively included in the reimbursement of General Partner expenses disclosed above due to common control.

COMMITMENTS AND CONTINGENCIES

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Operating Leases. We and Summit Investments lease certain office space to support our operations. We have determined that our leases are operating leases. We recognize total rent expense incurred or allocated to us in general and administrative expenses. Rent expense related to operating leases, including rent expense incurred on our behalf and allocated to us, was as follows:



	Three months ended March 31,
	2016		2015
	(In thousands)
Rent expense	$	616	$	506

Legal Proceedings. The Partnership is involved in various litigation and administrative proceedings arising in the normal course of business. In the opinion of management, any liabilities that may result from these claims or those arising in the normal course of business would not individually or in the aggregate have a material adverse effect on the Partnership's financial position or results of operations.

Environmental Matters. Although we believe that we are in material compliance with applicable environmental regulations, the risk of environmental remediation costs and liabilities are inherent in pipeline ownership and operation. Furthermore, we can provide no assurances that significant environmental remediation costs and liabilities will not be incurred by the Partnership in the future. We are currently not aware of any material contingent liabilities that exist with respect to environmental matters, except as noted below.

In January 2015, Summit Investments learned of the rupture of a four-inch produced water gathering pipeline on the Meadowlark Midstream gathering system near Williston, North Dakota. The rupture resulted in the release of some of the produced water in the pipeline. Based on Summit Investments' investigation and currently available information, it is at least reasonably possible that the rupture occurred on or prior to December 31, 2014. As such, Summit Investments accounted for the rupture as a 2014 event.

Summit Investments took action to minimize the impact of the rupture on affected landowners, control any environmental impact, help ensure containment and clean up the affected area. The incident, which is covered by Summit Investments' insurance policies, is subject to maximum coverage of $25.0 million from its pollution liability insurance policy and $200.0 million from its property and business interruption insurance policy. Summit Investments exhausted the $25.0 million pollution liability policy in 2015. Property and business interruption claim requests have been submitted, although no amounts have been recognized for any potential recoveries, under the property and business interruption insurance policy.



	Total
	(In thousands)
Accrued environmental remediation, January 1, 2015	$	30,000
Payments made by affiliates	(13,136		)
Payments made with proceeds from insurance policies	(25,000		)
Additional accruals	21,800
Accrued environmental remediation, December 31, 2015	$	13,664
Payments made by affiliates	(1,213		)
Accrued environmental remediation, March 31, 2016	$	12,451

As of March 31, 2016, we have recognized (i) a current liability for remediation effort expenditures expected to be incurred within the next 12 months and (ii) a noncurrent liability for estimated remediation expenditures and fines expected to be incurred subsequent to March 31, 2017. Each of these amounts represent our best estimate for costs expected to be incurred. Neither of these amounts has been discounted to its present value.

In 2015, the U.S. Department of Justice issued subpoenas to Summit Investments, the Partnership and our general partner requesting certain materials related to the rupture. We cannot predict the ultimate outcome of this matter with certainty for Summit Investments or Meadowlark Midstream, especially as it relates to any material liability as a result of any governmental proceeding related to the incident. SMLP and its general partner did not have any management or operational control over, or ownership interest in, Meadowlark Midstream or the produced water disposal pipeline prior to the 2016 Drop Down. Furthermore, the Contribution Agreement executed in connection with the 2016 Drop Down contains customary representations and warranties and Summit Investments has agreed to indemnify the Partnership with respect to certain losses, including losses related to the rupture. As a result, we believe at this time that it is unlikely that SMLP or its general partner will be subject to any material liability as a result of any governmental proceeding related to the rupture.

On June 19, 2015, Summit Investments and Meadowlark Midstream received a complaint from the North Dakota Industrial Commission seeking approximately $2.5 million in fines and other fees related to the rupture. Meadowlark Midstream has accrued its best estimate of the amount to be paid for such fines and other fees and intends to vigorously defend this complaint.

ACQUISITIONS AND DROP DOWN TRANSACTIONS

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

ACQUISITIONS AND DROP DOWN TRANSACTIONS

2016 Drop Down. On March 3, 2016, the Partnership acquired the 2016 Drop Down Assets. These assets include certain natural gas, crude oil and produced water gathering systems located in the Utica Shale, the Williston Basin and the DJ Basin as well as ownership interests in a natural gas gathering system and a condensate stabilization facility, both located in the Utica Shale.

The consideration for the 2016 Drop Down Assets (i) consisted of a cash payment to SMP Holdings of $360.0 million (the “Initial Payment”), funded with borrowings under our revolving credit facility and (ii) includes a deferred payment in 2020 (the “Deferred Purchase Price Obligation”). The Deferred Purchase Price Obligation will be equal to:


•	six-and-one-half (6.5) multiplied by the average Business Adjusted EBITDA, as defined below and in the Contribution Agreement, of the 2016 Drop Down Assets for 2018 and 2019, less the G&A Adjuster, as defined in the Contribution Agreement;


•	less the Initial Payment;


•	less all capital expenditures incurred for the 2016 Drop Down Assets between the Initial Close and December 31, 2019;


•	plus all Business Adjusted EBITDA from the 2016 Drop Down Assets between Initial Close and December 31, 2019, less the the Cumulative G&A Adjuster, as defined in the Contribution Agreement.

Business Adjusted EBITDA is defined as the net income or loss of the 2016 Drop Down Assets for such period:


•	plus interest expense, income tax expense, and depreciation and amortization of the 2016 Drop Down Assets for such period;


•	plus any adjustments related to MVC shortfall payments, impairments and other noncash expenses or losses with respect to the 2016 Drop Down Assets for such period;


•	plus any Special Liability Expenses, as defined below and in the Contribution Agreement, for such period;


•	less interest income and income tax benefit of the 2016 Drop Down Assets for such period;


•	less adjustments related to any other noncash income or gains with respect to the 2016 Drop Down Assets for such period.

Business Adjusted EBITDA shall exclude the effect of any Partnership expenses allocated by or to SMLP or its affiliates in respect of the 2016 Drop Down Assets, such as general and administrative expenses (including compensation-related expenses and professional services fees), transaction costs, and allocated interest expense and allocated income tax expense.

Special Liability Expenses are defined as any and all expenses incurred by SMLP with respect to the Special Liabilities, as defined in the Contribution Agreement, including fines, legal fees, consulting fees and remediation costs.

The present value of the Deferred Purchase Price Obligation will be reflected as a liability on our balance sheet until paid. As of the acquisition date, the estimated future payment obligation (based on management’s estimate of the Partnership’s share of forecasted Business Adjusted EBITDA and capital expenditures for the 2016 Drop Down Assets) was $860.3 million, which had a net present value of $507.4 million, using a discount rate of 13%. As of March 31, 2016, the net present value of this obligation was $514.9 million and has been recorded on the consolidated balance sheet. Deferred purchase price obligation expense for the three months ended March 31, 2016 was $7.5 million. Any subsequent changes to the estimated future payment obligation will be calculated using a discounted cash flow model with a commensurate risk-adjusted discount rate. Such changes and the impact on the liability due to the passage of time will be recorded as deferred purchase price obligation income or expense on the consolidated statements of operations in the period of the change.

At the discretion of the board of directors of our general partner, the Deferred Purchase Price Obligation can be paid in cash, SMLP common units or a combination thereof. We currently expect that the Deferred Purchase Price Obligation will be financed with a combination of (i) net proceeds from the sale of common units by us, (ii) the net proceeds from the issuance of senior unsecured debt by us, (iii) borrowings under our revolving credit facility and/or (iv) other internally generated sources of cash.

Because of the common control aspects in a drop down transaction, the 2016 Drop Down was deemed a transaction between entities under common control and, as such, has been accounted for on an “as-if pooled” basis for all periods in which common control existed. Subsequent to Initial Close, SMLP’s financial results will retrospectively include the combined financial results of the 2016 Drop Down Assets for all common-control periods.

Summit Utica. Summit Investments completed the acquisition of certain natural gas gathering assets located in the Utica Shale Play for $25.2 million on December 15, 2014. These assets, which were contributed to Summit Investments' then-newly formed subsidiary, Summit Utica, gather natural gas under a long-term, fee-based contract. Summit Investments accounted for the purchase under the acquisition method of accounting. As of December 31, 2014, we assigned the full purchase price to property, plant and equipment.

Ohio Gathering. For information on the acquisition and initial recognition of Ohio Gathering, see Note 7.

Meadowlark Midstream. At the time of the 2016 Drop Down, Meadowlark Midstream owned Niobrara G&P and certain crude oil and produced water gathering pipelines located in Williams County, North Dakota. Summit Investments accounted for its purchase of Meadowlark Midstream under the acquisition method of accounting, whereby the various gathering systems' identifiable tangible and intangible assets acquired and liabilities assumed were recorded based on their fair values as of initial acquisition on February 15, 2013. Both Bison Midstream and Polar Midstream have previously been carved out of Meadowlark Midstream. Their fair values were determined based upon assumptions related to future cash flows, discount rates, asset lives, and projected capital expenditures to complete the system. We recognized the 2016 acquisition of Meadowlark Midstream at Summit Investments' historical cost of construction and fair value of assets and liabilities at acquisition, which reflected its fair value accounting for the initial acquisition of Meadowlark Midstream in 2013, due to common control.

The fair values of the assets acquired and liabilities assumed as of February 15, 2013, were as follows (in thousands):



Purchase price assigned to Meadowlark Midstream			$	25,376
Current assets	$	2,227
Property, plant, and equipment	18,795
Other noncurrent assets	4,354
Total assets acquired	25,376
Total liabilities assumed	$	—
Net identifiable assets acquired			$	25,376

From a financial position and operational standpoint, the crude oil and produced water gathering pipelines held by Meadowlark Midstream and acquired in connection with the 2016 Drop Down are recognized as part of the Polar and Divide gathering system.

Supplemental Disclosures – As-If Pooled Basis. As a result of accounting for our drop down transactions similar to a pooling of interests, our historical financial statements and those of the 2016 Drop Down Assets and Polar and Divide have been combined to reflect the historical operations, financial position and cash flows from the date common control began. Revenues and net income or loss for the previously separate entities and the combined amounts, as presented in these unaudited condensed consolidated financial statements follow.



	Three months ended March 31,
	2016			2015
	(In thousands)
SMLP revenues	$	81,704		$	72,635
2016 Drop Down Assets revenues	8,867			4,870
Polar and Divide revenues (1)				8,582
Combined revenues	$	90,571		$	86,087

SMLP net (loss) income	$	(6,410	)	$	1,667
2016 Drop Down Assets net income (loss)	2,745			(7,498		)
Polar and Divide net income (1)				3,346
Combined net loss	$	(3,665	)	$	(2,485	)

__________

(1) Results are fully reflected in SMLP's results of operations subsequent to closing the respective drop down.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1490-128463

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 1
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7000-128479

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4922-128472

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1383-128463

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Basis of Presentation

Reclassifications

Property, Plant and Equipment



	Useful lives (In years)
Gathering and processing systems and related equipment	30
Other	4-15

Construction in progress is depreciated consistent with its applicable asset class once it is placed in service. Land and line fill are not depreciated.

Accrued capital expenditures are reflected in trade accounts payable.

Equity Method Investments

Other Noncurrent Assets

Deferred Purchase Price Obligation Income or Expense

Commitments and Contingencies

Noncontrolling Interest

Earnings or Loss Per Unit (EPU)

Comprehensive Income or Loss

Comprehensive Income or Loss. Comprehensive income or loss is the same as net income or loss for all periods presented.

Environmental Matters

Transactions Under Common Control

Recent Accounting Pronouncements

Accounting Pronouncements Pending Adoption. We are currently in the process of evaluating the applicability and/or impact of the following accounting pronouncements:


•	ASU No. 2014-09 Revenue From Contracts With Customers (Topic 606) ("ASU 2014-09"). There has been no to our position regarding ASU 2014-09 during the first quarter of 2016. See Note 2 to the consolidated financial statements included in the 2015 Annual Report for additional information.

•


•	ASU No. 2016-08 Revenue From Contracts With Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU No. 2016-08"). ASU No. 2016-08 does not change the core principle of Topic 606, rather it clarifies the implementation guidance on principal versus agent considerations. The effective date and transition for this update are the same as ASU 2014-09.

•

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION (Tables)

3 Months Ended

Mar. 31, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Error Corrections and Prior Period Adjustments

The impact of these reclassifications, which had no impact on net (loss) income, total partners' capital or segment adjusted EBITDA, follows.



	Three months ended March 31, 2015
	(In thousands)
Gathering services and related fees	$	3,419
Other revenues	638
Net impact on total revenues	$	4,057

Cost of natural gas and NGLs	$	4,057
Net impact on cost of natural gas and NGLs and total costs and expenses	$	4,057

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule of assets by reportable segment

Assets by reportable segment follow.



	March 31, 2016		December 31, 2015
	(In thousands)
Assets:
Utica Shale (1)	$	922,717	$	886,223
Williston Basin	725,641		740,361
Piceance/DJ Basins	829,608		866,095
Barnett Shale	411,118		416,586
Marcellus Shale	232,017		233,116
Total reportable segment assets	3,121,101		3,142,381
Corporate	13,782		22,291
Total assets	$	3,134,883	$	3,164,672

__________

(1) Represents the investment in equity method investees for Ohio Gathering (see Note 7) and total assets for Summit Utica.

Schedule of segment reporting information

Depreciation and amortization, including the amortization expense associated with our favorable and unfavorable gas gathering contracts as reported in other revenues, by reportable segment follows.



	Three months ended March 31,
	2016		2015
	(In thousands)
Depreciation and amortization:
Utica Shale	$	844	$	139
Williston Basin	8,357		7,368
Piceance/DJ Basins	12,273		11,783
Barnett Shale	4,056		4,157
Marcellus Shale	2,219		2,168
Total reportable segment depreciation and amortization	27,749		25,615
Corporate	116		166
Total depreciation and amortization	$	27,865	$	25,781

Capital expenditures by reportable segment follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Capital expenditures:
Utica Shale	$	34,988	$	22,565
Williston Basin	18,034		18,310
Piceance/DJ Basins	5,824		6,808
Barnett Shale	563		893
Marcellus Shale	1,738		496
Total reportable segment capital expenditures	61,147		49,072
Corporate	179		398
Total capital expenditures	$	61,326	$	49,470

Revenues by reportable segment follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Revenues:
Utica Shale	$	4,283	$	389
Williston Basin	30,008		23,066
Piceance/DJ Basins	28,993		30,894
Barnett Shale	20,402		23,897
Marcellus Shale	6,885		7,841
Total reportable segment revenues and total revenues	$	90,571	$	86,087

Adjustments related to MVC shortfall payments by reportable segment follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Adjustments related to MVC shortfall payments:
Williston Basin	$	3,536	$	2,653
Piceance/DJ Basins	7,517		9,903
Barnett Shale	89		(223		)
Total adjustments related to MVC shortfall payments	$	11,142	$	12,333

Segment adjusted EBITDA by reportable segment follows.



	Three months ended March 31,
	2016		2015
	(In thousands)
Reportable segment adjusted EBITDA:
Utica Shale (1)	$	15,577	$	5,206
Williston Basin	19,719		10,975
Piceance/DJ Basins	24,817		28,702
Barnett Shale	14,077		16,760
Marcellus Shale	4,600		6,536
Total reportable segment adjusted EBITDA	$	78,790	$	68,179

__________

Schedule of counterparties accounting for more than 10% of total revenues

Counterparties accounting for more than 10% of total revenues were as follows:



	Three months ended March 31,
	2016	2015
Percentage of total revenues:
Counterparty A - Piceance/DJ Basins	*	13	%

__________

* Less than 10%

Reconciliation of net income to adjusted EBITDA

A reconciliation of loss before income taxes to total reportable segment adjusted EBITDA follows.



	Three months ended March 31,
	2016			2015
	(In thousands)
Reconciliation of Loss Before Income Taxes to Segment Adjusted EBITDA:
Loss before income taxes	$	(6,602	)	$	1,713
Add:
Allocated corporate expenses	8,781			6,623
Interest expense	15,882			14,904
Deferred purchase price obligation expense	7,463			—
Depreciation and amortization	27,865			25,781
Proportional adjusted EBITDA for equity method investees	12,388			5,263
Adjustments related to MVC shortfall payments	11,142			12,333
Unit-based and noncash compensation	1,956			1,563
Loss on asset sales	—			—
Less:
Interest income	22			1
Gain on asset sales	63			—
Total reportable segment adjusted EBITDA	$	78,790		$	68,179

PROPERTY, PLANT, AND EQUIPMENT, NET (Tables)

3 Months Ended

Mar. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of property, plant, and equipment, net

Details on property, plant, and equipment follow.



	March 31, 2016		December 31, 2015
	(In thousands)
Gathering and processing systems and related equipment	$	1,918,080	$	1,883,139
Construction in progress	77,596		75,132
Land and line fill	11,436		11,055
Other	32,931		32,427
Total	2,040,043		2,001,753
Less accumulated depreciation	206,278		188,970
Property, plant, and equipment, net	$	1,833,765	$	1,812,783

Schedule of depreciation expense and capitalized interest

Depreciation expense and capitalized interest follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
Depreciation expense	$	17,370	$	15,264
Capitalized interest	716		527

AMORTIZING INTANGIBLE ASSETS AND UNFAVORABLE GAS GATHERING CONTRACT (Tables)

3 Months Ended

Mar. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible assets and liabilities subject to amortization

Details regarding our intangible assets and the unfavorable gas gathering contract (included in other noncurrent liabilities), all of which are subject to amortization, follow.



	March 31, 2016
	Useful lives (In years)	Gross carrying amount		Accumulated amortization			Net

		(Dollars in thousands)
Favorable gas gathering contracts	18.7	$	24,195	$	(9,872	)	$	14,323
Contract intangibles	12.5	426,464		(119,906		)	306,558
Rights-of-way	26.1	152,195		(20,409		)	131,786
Total intangible assets		$	602,854	$	(150,187	)	$	452,667

Unfavorable gas gathering contract	10.0	$	10,962	$	(6,278	)	$	4,684



	December 31, 2015
	Useful lives (In years)	Gross carrying amount		Accumulated amortization			Net

		(Dollars in thousands)
Favorable gas gathering contracts	18.7	$	24,195	$	(9,534	)	$	14,661
Contract intangibles	12.5	426,464		(111,052		)	315,412
Rights-of-way	26.3	150,143		(18,906		)	131,237
Total intangible assets		$	600,802	$	(139,492	)	$	461,310

Unfavorable gas gathering contract	10.0	$	10,962	$	(6,077	)	$	4,885

Recognized amortization expense in other revenues and cost and expenses

We recognized amortization expense in other revenues as follows:



	Three months ended March 31,
	2016			2015

	(In thousands)
Amortization expense – favorable gas gathering contracts	$	(338	)	$	(426	)
Amortization expense – unfavorable gas gathering contract	201			175

We recognized amortization expense in costs and expenses as follows:



	Three months ended March 31,
	2016		2015

	(In thousands)
Amortization expense – contract intangibles	$	8,854	$	8,835
Amortization expense – rights-of-way	1,503		1,431

Estimated aggregate annual amortization expected to be recognized

The estimated aggregate annual amortization expected to be recognized for the remainder of 2016 and each of the four succeeding fiscal years follows.



	Intangible assets		Unfavorable gas gathering contract

	(In thousands)
2016	$	32,500	$	729
2017	42,028		1,047
2018	41,482		1,035
2019	41,727		1,045
2020	44,373		828

EQUITY METHOD INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Equity Method Investments and Joint Ventures [Abstract]

Equity Method Investments

A rollforward of the investment in equity method investees follows.



	2016			2015
	(In thousands)
Investment in equity method investees, January 1	$	751,168		$	706,172
Cash contributions	15,645			27,830
Cash distributions	(11,804		)	(6,849		)
Income (loss) from equity method investees	6,198			(430		)
Amortization of basis difference in equity method investees	(3,338		)	(3,338		)
Investment in equity method investees, March 31	757,869			723,385
March cash contributions	(4,291		)	—
March cash distributions	4,816			1,884
Basis difference	(153,551		)	(166,903		)
Investment in equity method investees, net of basis difference, February 29, 2016 and February 28, 2015	$	604,843		$	558,366

The following table presents summarized balance sheet information for Ohio Gathering.



	February 29, 2016		February 28, 2015
	(In thousands)
Total assets	$	1,513,668	$	1,427,142
Total liabilities	45,176		74,674
Members' equity	1,468,492		1,352,468

The following table presents summarized statements of operations information for Ohio Gathering for the three-month periods ended February 29, 2016 and February 28, 2015.



	Three months ended February 29, 2016		Three months ended February 28, 2015
	(In thousands)
Total revenues	$	42,997	$	23,680
Total operating expenses	27,092		24,757
Net income (loss)	15,725		(1,077		)

DEFERRED REVENUE (Tables)

3 Months Ended

Mar. 31, 2016

Deferred Revenue Disclosure [Abstract]

Rollforward of deferred revenue

A rollforward of current deferred revenue follows.



	Williston Basin		Barnett Shale		Piceance/DJ Basins			Total current
	(In thousands)
Current deferred revenue, January 1, 2016	$	—	$	677	$	—		$	677
Additions	—		—		2,722			2,722
Less revenue recognized	—		—		(2,722		)	(2,722		)
Current deferred revenue, March 31, 2016	$	—	$	677	$	—		$	677

A rollforward of noncurrent deferred revenue follows.



	Williston Basin		Barnett Shale		Piceance/DJ Basins		Total noncurrent
	(In thousands)
Noncurrent deferred revenue, January 1, 2016	$	29,002	$	—	$	16,484	$	45,486
Additions	235		—		1,238		1,473
Less revenue recognized	—		—		—		—
Noncurrent deferred revenue, March 31, 2016	$	29,237	$	—	$	17,722	$	46,959

DEBT (Tables)

3 Months Ended

Mar. 31, 2016

Debt Disclosure [Abstract]

Schedule of debt and capital leases

Debt consisted of the following:



	March 31, 2016			December 31, 2015
	(In thousands)
Summit Holdings variable rate senior secured revolving credit facility (3.19% at March 31, 2016 and 2.93% at December 31, 2015) due November 2018	$	721,000		$	344,000
SMP Holdings variable rate senior secured revolving credit facility (2.43% at December 31, 2015) (1)	—			115,000
SMP Holdings variable rate senior secured term loan (2.43% at December 31, 2015) (1)	—			217,500
Summit Holdings 5.50% Senior unsecured notes due August 2022	300,000			300,000
less unamortized deferred loan costs (2)	(3,981		)	(4,139		)
Summit Holdings 7.50% Senior unsecured notes due July 2021	300,000			300,000
less unamortized deferred loan costs (2)	(4,861		)	(5,091		)
Total long-term debt	$	1,312,158		$	1,267,270

__________

(1) Debt was allocated to the 2016 Drop Down Assets prior to the closing of the 2016 Drop Down but was retained by Summit Investments after close.

(2) Issuance costs are being amortized over the life of the notes.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

FINANCIAL INSTRUMENTS (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Level 3 Fair Value Reconciliation

The roll-forward of the Level 3 liabilities measured at fair value on a recurring basis follows.



	Three months ended March 31, 2016		Three months ended March 31, 2015
	(In thousands)
Level 3 liabilities, beginning of period	$	—	$	—
Additions	507,427		—
Change in fair value	7,463		—
Level 3 liabilities, end of period	$	514,890	$	—

Summary of the estimated fair value of debt instruments

A summary of the estimated fair value of our debt financial instruments follows.



	March 31, 2016				December 31, 2015
	Carrying value		Estimated fair value (1)		Carrying value		Estimated fair value (1)
	(In thousands)
Summit Holdings revolving credit facility	$	721,000	$	721,000	$	344,000	$	344,000
SMP Holdings revolving credit facility (2)	—		—		115,000		115,000
SMP Holdings term loan (2)	—		—		217,500		217,500
5.5% Senior notes ($300.0 million principal)	296,019		213,000		295,861		224,000
7.5% Senior notes ($300.0 million principal)	295,139		237,750		294,909		257,000

__________

(1) All estimated fair value calculations are Level 2.

(2) Debt was allocated to the 2016 Drop Down Assets prior to the closing of the 2016 Drop Down but was retained by Summit Investments after close.

PARTNERS' CAPITAL (Tables)

3 Months Ended

Mar. 31, 2016

Equity [Abstract]

Schedule of partner units activity

A rollforward of the number of common limited partner, subordinated limited partner and general partner units follows.



	Common	Subordinated		General partner	Total
Units, January 1, 2016	42,062,644	24,409,850		1,354,700	67,827,194
Net units issued under SMLP LTIP	114,741	—		—	114,741
Subordinated unit conversion	24,409,850	(24,409,850	)	—	—
Units, March 31, 2016	66,587,235	—		1,354,700	67,941,935

Schedule of Capital Distribution and Allocation to Partners

The calculation of the capital distribution and its allocation to partners' capital follows (in thousands).



Summit Investments' net investment in the 2016 Drop Down Assets	$	771,929
SMP Holdings borrowings allocated to 2016 Drop Down Assets and retained by Summit Investments	342,926
Acquired carrying value of 2016 Drop Down Assets			$	1,114,855

Deferred purchase price obligation	$	507,427
Borrowings under revolving credit facility	360,000
Total consideration paid and recognized by SMLP			867,427
Excess of acquired carrying value over consideration paid and recognized			$	247,428

Allocation of capital contribution:
General partner interest	$	4,942
Common limited partner interest	242,486
Partners' capital contribution – excess of acquired carrying value over consideration paid and recognized			$	247,428

Details of cash distributions

Cash Distributions Paid and Declared. We paid the following per-unit distributions during the three months ended March 31:



	Three months ended March 31,
	2016		2015
Per-unit distributions to unitholders	$	0.575	$	0.560

Our payment of IDRs as reported in distributions to unitholders – general partner in the statement of partners' capital during the three months ended March 31 follow.



	Three months ended March 31,
	2016		2015
	(In thousands)
IDR payments	$	1,935	$	1,442

EARNINGS PER UNIT (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Schedule of earnings per limited partner unit

The following table details the components of EPU.



	Three months ended March 31,
	2016			2015
	(In thousands, except per-unit amounts)
Numerator for basic and diluted EPU:
Allocation of net (loss) income among limited partner interests:
Net (loss) income attributable to common units	$	(8,264	)	$	69
Net income attributable to subordinated units (1)				30
Net (loss) income attributable to limited partners	$	(8,264	)	$	99

Denominator for basic and diluted EPU:
Weighted-average common units outstanding – basic	66,493			34,439
Effect of nonvested phantom units	—			146
Weighted-average common units outstanding – diluted	66,493			34,585

Weighted-average subordinated units outstanding – basic and diluted (1)				24,410

(Loss) earnings per limited partner unit:
Common unit – basic	$	(0.12	)	$	0.00
Common unit – diluted	$	(0.12	)	$	0.00
Subordinated unit – basic and diluted (1)				$	0.00

__________

(1) The subordinated units converted to common units on a one-for-one basis in February 2016 (see Note 11).

UNIT-BASED AND NONCASH COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of unit-based compensation recognized in general and administrative expense

compensation recognized in general and administrative expense related to the SMP Net Profits Interests was as follows:



	Three months ended March 31,
	2016		2015
	(In thousands)
SMP Net Profits Interests noncash compensation	$	195	$	251

RELATED-PARTY TRANSACTIONS (Tables)

3 Months Ended

Mar. 31, 2016

Schedule of related party transactions

Expenses incurred by the general partner and reimbursed by us under our partnership agreement were as follows:



	Three months ended March 31,
	2016		2015
	(In thousands)
Operation and maintenance expense	$	6,749	$	6,474
General and administrative expense	7,778		7,135

COMMITMENTS AND CONTINGENCIES (Tables)

3 Months Ended

Mar. 31, 2016

Commitments and Contingencies Disclosure [Abstract]

Schedule of total rent expense related to operating leases

Rent expense related to operating leases, including rent expense incurred on our behalf and allocated to us, was as follows:



	Three months ended March 31,
	2016		2015
	(In thousands)
Rent expense	$	616	$	506

Accrued environmental remediation



	Total
	(In thousands)
Accrued environmental remediation, January 1, 2015	$	30,000
Payments made by affiliates	(13,136		)
Payments made with proceeds from insurance policies	(25,000		)
Additional accruals	21,800
Accrued environmental remediation, December 31, 2015	$	13,664
Payments made by affiliates	(1,213		)
Accrued environmental remediation, March 31, 2016	$	12,451

ACQUISITIONS AND DROP DOWN TRANSACTIONS (Tables)

3 Months Ended

Mar. 31, 2016

Business Combinations [Abstract]

Fair Value of Assets Acquired and Liabilities Assumed

The fair values of the assets acquired and liabilities assumed as of February 15, 2013, were as follows (in thousands):



Purchase price assigned to Meadowlark Midstream			$	25,376
Current assets	$	2,227
Property, plant, and equipment	18,795
Other noncurrent assets	4,354
Total assets acquired	25,376
Total liabilities assumed	$	—
Net identifiable assets acquired			$	25,376

Schedule of Revenue and Net Income Disclosures

Revenues and net income or loss for the previously separate entities and the combined amounts, as presented in these unaudited condensed consolidated financial statements follow.



	Three months ended March 31,
	2016			2015
	(In thousands)
SMLP revenues	$	81,704		$	72,635
2016 Drop Down Assets revenues	8,867			4,870
Polar and Divide revenues (1)				8,582
Combined revenues	$	90,571		$	86,087

SMLP net (loss) income	$	(6,410	)	$	1,667
2016 Drop Down Assets net income (loss)	2,745			(7,498		)
Polar and Divide net income (1)				3,346
Combined net loss	$	(3,665	)	$	(2,485	)

__________

(1) Results are fully reflected in SMLP's results of operations subsequent to closing the respective drop down.

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION (Details) - USD ($) $ in Millions		3 Months Ended
	Feb. 25, 2016	Mar. 31, 2016	Mar. 03, 2016	Dec. 31, 2015
ORGANIZATION AND BUSINESS OPERATIONS
Common limited partner capital, units outstanding		66,587,000		42,063,000
General partner
ORGANIZATION AND BUSINESS OPERATIONS
General partner interest (as a percent)		2.00%
Summit Investments \| General partner \| Summit Midstream Partners, LP
ORGANIZATION AND BUSINESS OPERATIONS
General partner interest (as a percent)		2.00%
SMP Holdings \| Ohio Gathering
ORGANIZATION AND BUSINESS OPERATIONS
Join venture interest	40.00%
Drop Down Assets 2016 Acquisition
ORGANIZATION AND BUSINESS OPERATIONS
Ownership percent			99.00%
Noncontrolling interest percent		1.00%	1.00%
Common units \| SMP Holdings
ORGANIZATION AND BUSINESS OPERATIONS
Common limited partner capital, units outstanding		29,854,581
Accounting Standards Update 2015-03 \| Other noncurrent assets
ORGANIZATION AND BUSINESS OPERATIONS
Deferred loan costs				$ (9.2)
Accounting Standards Update 2015-03 \| Other Noncurrent Assets
ORGANIZATION AND BUSINESS OPERATIONS
Deferred loan costs				$ 9.2

ORGANIZATION, BUSINESS OPERATIONS AND PRESENTATION AND CONSOLIDATION Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Retained Earnings Adjustments [Line Items]
Gathering services and related fees	$ 78,100	$ 68,440
Other revenues	4,883	5,034
Net impact on total revenues	90,571	86,087
Cost of natural gas and NGLs	6,290	9,441
Net impact on cost of natural gas and NGLs and total costs and expenses	$ 73,850	69,471
Reclassifications of Revenues and Expenses
Retained Earnings Adjustments [Line Items]
Gathering services and related fees		3,419
Other revenues		638
Net impact on total revenues		4,057
Cost of natural gas and NGLs		4,057
Net impact on cost of natural gas and NGLs and total costs and expenses		$ 4,057

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable and Property, Plant and Equipment (Details)	3 Months Ended
	Mar. 31, 2016
Gathering and processing systems and related equipment
Property, Plant and Equipment [Line Items]
Useful life	30 years
Other \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	4 years
Other \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	15 years

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Income Taxes and EPS (Details)	3 Months Ended
	Mar. 31, 2016	Mar. 03, 2016
General partner
Significant Accounting Policies [Line Items]
General partner interest (as a percent)	2.00%
Drop Down Assets 2016 Acquisition
Significant Accounting Policies [Line Items]
Noncontrolling interest percent	1.00%	1.00%

SEGMENT INFORMATION - Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Assets	$ 3,134,883	$ 3,164,672
Reportable Segments
Segment Reporting Information [Line Items]
Assets	3,121,101	3,142,381
Reportable Segments \| Utica Shale
Segment Reporting Information [Line Items]
Assets	922,717	886,223
Reportable Segments \| Williston Basin
Segment Reporting Information [Line Items]
Assets	725,641	740,361
Reportable Segments \| Piceance/DJ Basins
Segment Reporting Information [Line Items]
Assets	829,608	866,095
Reportable Segments \| Barnett Shale
Segment Reporting Information [Line Items]
Assets	411,118	416,586
Reportable Segments \| Marcellus Shale
Segment Reporting Information [Line Items]
Assets	232,017	233,116
Corporate
Segment Reporting Information [Line Items]
Assets	$ 13,782	$ 22,291

SEGMENT INFORMATION - Revenues, Depreciation and Amortization, and Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 90,571	$ 86,087
Depreciation and amortization	27,865	25,781
Capital expenditures	61,326	49,470
Reportable Segments
Segment Reporting Information [Line Items]
Revenues	90,571	86,087
Depreciation and amortization	27,749	25,615
Capital expenditures	61,147	49,072
Reportable Segments \| Utica Shale
Segment Reporting Information [Line Items]
Revenues	4,283	389
Depreciation and amortization	844	139
Capital expenditures	34,988	22,565
Reportable Segments \| Williston Basin
Segment Reporting Information [Line Items]
Revenues	30,008	23,066
Depreciation and amortization	8,357	7,368
Capital expenditures	18,034	18,310
Reportable Segments \| Piceance/DJ Basins
Segment Reporting Information [Line Items]
Revenues	28,993	30,894
Depreciation and amortization	12,273	11,783
Capital expenditures	5,824	6,808
Reportable Segments \| Barnett Shale
Segment Reporting Information [Line Items]
Revenues	20,402	23,897
Depreciation and amortization	4,056	4,157
Capital expenditures	563	893
Reportable Segments \| Marcellus Shale
Segment Reporting Information [Line Items]
Revenues	6,885	7,841
Depreciation and amortization	2,219	2,168
Capital expenditures	1,738	496
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	116	166
Capital expenditures	$ 179	$ 398

SEGMENT INFORMATION - Concentration Risk (Details)	3 Months Ended
SEGMENT INFORMATION - Concentration Risk (Details)	Mar. 31, 2016	Mar. 31, 2015
Counterparty A - Piceance \| Revenue \| Customer concentration
Segment Reporting Information [Line Items]
Percent of total revenue (less than 10% for 2016)	10.00%	13.00%

SEGMENT INFORMATION - Adjusted EBITDA by Reportable Segment (Details) - Reportable Segments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 78,790	$ 68,179
Utica Shale
Segment Reporting Information [Line Items]
Adjusted EBITDA	15,577	5,206
Williston Basin
Segment Reporting Information [Line Items]
Adjusted EBITDA	19,719	10,975
Piceance/DJ Basins
Segment Reporting Information [Line Items]
Adjusted EBITDA	24,817	28,702
Barnett Shale
Segment Reporting Information [Line Items]
Adjusted EBITDA	14,077	16,760
Marcellus Shale
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 4,600	$ 6,536

SEGMENT INFORMATION - Reconciliation of Net Income to Adjusted EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Loss before income taxes	$ (6,602)	$ 1,713
Add:
Interest expense	15,882	14,904
Deferred purchase price obligation expense	7,463	0
Depreciation and amortization	27,865	25,781
Proportional adjusted EBITDA for equity method investees	12,388	5,263
Adjustments related to MVC shortfall payments	11,142	12,333
Unit-based and noncash compensation	1,956	1,563
Loss on asset sales	0	0
Less:
Interest income	22	1
Gain on asset sales	63	0
Corporate
Add:
Allocated corporate expenses	8,781	6,623
Depreciation and amortization	116	166
Reportable Segments
Add:
Depreciation and amortization	27,749	25,615
Less:
Total reportable segment adjusted EBITDA	$ 78,790	$ 68,179

SEGMENT INFORMATION - Adjustments Related to MVC Shortfall Payments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	$ 11,142	$ 12,333
Reportable Segments \| Williston Basin
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	3,536	2,653
Reportable Segments \| Piceance/DJ Basins
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	7,517	9,903
Reportable Segments \| Barnett Shale
Segment Reporting Information [Line Items]
Adjustments related to MVC shortfall payments	$ 89	$ (223)

PROPERTY, PLANT, AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Gross	$ 2,040,043		$ 2,001,753
Less accumulated depreciation	206,278		188,970
Property, plant, and equipment, net	1,833,765		1,812,783
Depreciation expense	17,370	$ 15,264
Capitalized interest	716	$ 527
Gathering and processing systems and related equipment
Property, Plant and Equipment [Line Items]
Gross	1,918,080		1,883,139
Construction in progress
Property, Plant and Equipment [Line Items]
Gross	77,596		75,132
Land and line fill
Property, Plant and Equipment [Line Items]
Gross	11,436		11,055
Other
Property, Plant and Equipment [Line Items]
Gross	$ 32,931		$ 32,427

AMORTIZING INTANGIBLE ASSETS AND UNFAVORABLE GAS GATHERING CONTRACT (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 602,854		$ 600,802
Accumulated amortization	(150,187)		(139,492)
Total intangible assets, net	$ 452,667		$ 461,310
Noncurrent liability
Unfavorable gas gathering contract, useful lives	10 years		10 years
Unfavorable contract, gross carrying amount	$ 10,962		$ 10,962
Unfavorable gas gathering contract, accumulated amortization	(6,278)		(6,077)
Unfavorable gas gathering contract, Net	4,684		$ 4,885
Amortization expense
Amortization expense - unfavorable contract	201	$ 175
Intangible assets
2016	32,500
2017	42,028
2018	41,482
2019	41,727
2020	44,373
Unfavorable gas gathering contract
2016	729
2017	1,047
2018	1,035
2019	1,045
2020	$ 828
Favorable gas gathering contract
Finite-Lived Intangible Assets [Line Items]
Useful lives (In years)	18 years 8 months 12 days		18 years 8 months 12 days
Gross carrying amount	$ 24,195		$ 24,195
Accumulated amortization	(9,872)		(9,534)
Total intangible assets, net	14,323		$ 14,661
Amortization expense
Amortization expense	$ 338	426
Contract intangibles
Finite-Lived Intangible Assets [Line Items]
Useful lives (In years)	12 years 6 months		12 years 6 months
Gross carrying amount	$ 426,464		$ 426,464
Accumulated amortization	(119,906)		(111,052)
Total intangible assets, net	306,558		$ 315,412
Amortization expense
Amortization expense	$ 8,854	8,835
Rights-of-way
Finite-Lived Intangible Assets [Line Items]
Useful lives (In years)	26 years 1 month		26 years 4 months
Gross carrying amount	$ 152,195		$ 150,143
Accumulated amortization	(20,409)		(18,906)
Total intangible assets, net	131,786		$ 131,237
Amortization expense
Amortization expense	$ 1,503	$ 1,431

GOODWILL (Details) $ in Millions	12 Months Ended
GOODWILL (Details) $ in Millions	Dec. 31, 2015 USD ($)
Piceance/DJ Basins
Goodwill [Line Items]
Goodwill impairment	$ 45.5
Williston Basin
Goodwill [Line Items]
Goodwill impairment	$ 203.4

EQUITY METHOD INVESTMENTS - Narrative (Details) - Ohio Gathering - USD ($) $ in Thousands	1 Months Ended				3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	May 31, 2014	Jan. 31, 2014	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Additional capital contribution	$ 4,291	$ 0			$ 15,645	$ 27,830
Non-affiliated owners' interest percent			60.00%
Option value				$ 7,500
Principal Owner
Schedule of Equity Method Investments [Line Items]
Cost method ownership interest				1.00%
Ownership interest value				$ 190,000
Capital contribution				$ 8,400
Equity method potential ownership interest				40.00%
Equity method ownership interest			40.00%
Capital contributions true-ups			$ 326,600
Additional capital contribution			50,400
Management fee			$ 5,100

EQUITY METHOD INVESTMENTS - Rollforward of the Investment in Equity Method Investees (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Equity Method Investment [Roll Forward]
Investment in equity method investees			$ 751,168
Cash distributions			11,804	$ 6,849
Income (loss) from equity method investees			2,860	(3,768)
Investment in equity method investees	$ 757,869		757,869
Ohio Gathering
Equity Method Investment [Roll Forward]
Investment in equity method investees	604,843	$ 558,366	751,168	706,172
Cash contributions	(4,291)	0	(15,645)	(27,830)
Cash distributions	4,816	1,884	11,804	6,849
Income (loss) from equity method investees			6,198	(430)
Amortization of basis difference in equity method investees	(153,551)	(166,903)	(3,338)	(3,338)
Investment in equity method investees	$ 757,869	$ 723,385	$ 757,869	$ 723,385

EQUITY METHOD INVESTMENTS - Balance Sheet Information (Details) - Ohio Gathering - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
Schedule of Equity Method Investments [Line Items]
Total assets	$ 1,513,668	$ 1,427,142
Total liabilities	45,176	74,674
Members' equity	$ 1,468,492	$ 1,352,468

EQUITY METHOD INVESTMENTS - Statements of Operations Information (Details) - Ohio Gathering - USD ($) $ in Thousands	3 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 42,997	$ 23,680
Total operating expenses	27,092	24,757
Net income (loss)	$ 15,725	$ (1,077)

DEFERRED REVENUE (Details) $ in Thousands	3 Months Ended
DEFERRED REVENUE (Details) $ in Thousands	Mar. 31, 2016 USD ($)
Movement in Deferred Revenue [Roll Forward]
Current deferred revenue, beginning balance	$ 677
Additions, current	2,722
Less revenue recognized, current	(2,722)
Current deferred revenue, ending balance	677
Noncurrent deferred revenue, beginning balance	45,486
Additions, noncurrent	1,473
Less revenue recognized, noncurrent	0
Noncurrent deferred revenue, ending balance	46,959
Shortfall payments billed and included in accounts receivable	1,600
Williston Basin
Movement in Deferred Revenue [Roll Forward]
Current deferred revenue, beginning balance	0
Additions, current	0
Less revenue recognized, current	0
Current deferred revenue, ending balance	0
Noncurrent deferred revenue, beginning balance	29,002
Additions, noncurrent	235
Less revenue recognized, noncurrent	0
Noncurrent deferred revenue, ending balance	29,237
Barnett Shale
Movement in Deferred Revenue [Roll Forward]
Current deferred revenue, beginning balance	677
Additions, current	0
Less revenue recognized, current	0
Current deferred revenue, ending balance	677
Noncurrent deferred revenue, beginning balance	0
Additions, noncurrent	0
Less revenue recognized, noncurrent	0
Noncurrent deferred revenue, ending balance	0
Piceance/DJ Basins
Movement in Deferred Revenue [Roll Forward]
Current deferred revenue, beginning balance	0
Additions, current	2,722
Less revenue recognized, current	(2,722)
Current deferred revenue, ending balance	0
Noncurrent deferred revenue, beginning balance	16,484
Additions, noncurrent	1,238
Less revenue recognized, noncurrent	0
Noncurrent deferred revenue, ending balance	$ 17,722

DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Line of Credit Facility [Line Items]
Total long-term debt	$ 1,312,158	$ 1,267,270
Revolving credit facility
Line of Credit Facility [Line Items]
Revolving credit facility	$ 721,000	$ 344,000
Variable interest rate	3.19%	2.93%
Senior Notes \| 5.5% Senior Notes
Line of Credit Facility [Line Items]
Senior unsecured notes	$ 300,000	$ 300,000
less unamortized deferred loan costs (2)	$ (3,981)	$ (4,139)
Stated interest rate	5.50%	5.50%
Senior Notes \| 7.5% Senior Notes
Line of Credit Facility [Line Items]
Senior unsecured notes	$ 300,000	$ 300,000
less unamortized deferred loan costs (2)	$ (4,861)	$ (5,091)
Stated interest rate	7.50%	7.50%
SMP Holdings \| Revolving credit facility
Line of Credit Facility [Line Items]
Revolving credit facility	$ 0	$ 115,000
Variable interest rate		2.43%
SMP Holdings \| Senior Secured Term Loan
Line of Credit Facility [Line Items]
Secured Debt	$ 0	$ 217,500
Effective percentage		2.43%

DEBT - Revolving Credit Facility (Details)			3 Months Ended
DEBT - Revolving Credit Facility (Details)	Feb. 25, 2016 USD ($)	Feb. 24, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015
Revolving credit facility
Line of Credit Facility [Line Items]
Borrowing capacity	$ 1,250,000,000.00	$ 700,000,000.0
Total leverage ratio	5.50	5.0
Accordion feature	$ 200,000,000.0
Commitment fee on unused portion of the facility (as a percent)			0.50%
Interest rate at period end			3.19%	2.93%
Unused portion under the facility			$ 529,000,000
Maximum cumulative lease payment obligations allowable under terms of covenants	$ 30,000,000.0
Period that cumulative lease payment obligations may not exceed specified amount under terms of covenants	12 months
Trailing period used in calculating the ratio of EBITDA to net interest expense	12 months
Ratio of consolidated EBITDA to net interest expense	2.5
Trailing period used in calculating the ratio of total indebtedness to consolidated EBITDA	12 months
Ratio of total indebtedness to consolidated EBITDA	5.0
Ratio of total indebtedness to consolidated EBITDA, for a specified period following certain acquisitions	5.5
Period following certain acquisitions, for which higher ratio of total indebtedness to consolidated EBITDA is to be maintained			270 days
Debt defaults			$ 0
Senior secured leverage ratio	3.75
Senior Notes
Line of Credit Facility [Line Items]
Debt defaults			$ 0
Senior Notes \| Summit Holdings and Finance Corporation
Line of Credit Facility [Line Items]
Buy-back of debt, up to	$ 100,000,000
LIBOR \| Revolving credit facility
Line of Credit Facility [Line Items]
Applicable margin (as a percent)			2.75%
Minimum \| Revolving credit facility
Line of Credit Facility [Line Items]
Commitment fee on unused portion of the facility (as a percent)			0.30%
Minimum \| ABR \| Revolving credit facility
Line of Credit Facility [Line Items]
Applicable margin (as a percent)			0.75%
Minimum \| LIBOR \| Revolving credit facility
Line of Credit Facility [Line Items]
Applicable margin (as a percent)			1.75%
Maximum \| Revolving credit facility
Line of Credit Facility [Line Items]
Commitment fee on unused portion of the facility (as a percent)			0.50%
Maximum \| ABR \| Revolving credit facility
Line of Credit Facility [Line Items]
Applicable margin (as a percent)			1.75%
Maximum \| LIBOR \| Revolving credit facility
Line of Credit Facility [Line Items]
Applicable margin (as a percent)			2.75%

DEBT - Senior Notes (Details) - USD ($)	1 Months Ended
DEBT - Senior Notes (Details) - USD ($)	Jul. 31, 2014	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2013
Summit Holdings \| Finance Corp.
Debt Instrument [Line Items]
Cumulative percentage ownership in subsidiary	100.00%
Senior Notes
Debt Instrument [Line Items]
Debt defaults		$ 0
5.5% Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate		5.50%	5.50%
5.5% Senior Notes \| Senior Notes \| Summit Holdings and Finance Corporation
Debt Instrument [Line Items]
Senior unsecured notes	$ 300,000,000.0
Stated interest rate	5.50%
7.5% Senior Notes \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate		7.50%	7.50%
7.5% Senior Notes \| Senior Notes \| Summit Holdings and Finance Corporation
Debt Instrument [Line Items]
Senior unsecured notes				$ 300,000,000.0
Stated interest rate				7.50%

FINANCIAL INSTRUMENTS - Concentration Risk (Details) - Accounts receivable - Customer concentration - customer	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
CONCENTRATIONS OF RISK
Concentration risk, number	5	5
Concentration risk, percentage	49.00%	68.00%

FINANCIAL INSTRUMENTS - Level 3 Reconciliation (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Level 3 liabilities, beginning of period	$ 0	$ 0
Additions	507,427	0
Change in fair value	7,463
Level 3 liabilities, beginning of period	$ 514,890	$ 0

FINANCIAL INSTRUMENTS - Fair value of Debt Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying value \| Revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility, Estimated fair value (Level 2)	$ 721,000	$ 344,000
Carrying value \| SMP Holdings \| Revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility, Estimated fair value (Level 2)	0	115,000
Carrying value \| Senior Secured Term Loan \| SMP Holdings
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loan, Estimated fair value	0	217,500
Carrying value \| 5.5% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, Estimated fair value (Level 2)	296,019	295,861
Carrying value \| 7.5% Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, Estimated fair value (Level 2)	295,139	294,909
Estimated fair value \| Revolving credit facility \| Fair value, Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility, Estimated fair value (Level 2)	721,000	344,000
Estimated fair value \| SMP Holdings \| Revolving credit facility \| Fair value, Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Revolving credit facility, Estimated fair value (Level 2)	0	115,000
Estimated fair value \| Senior Secured Term Loan \| SMP Holdings \| Fair value, Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Term loan, Estimated fair value	0	217,500
Estimated fair value \| 5.5% Senior Notes \| Fair value, Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, Estimated fair value (Level 2)	213,000	224,000
Estimated fair value \| 7.5% Senior Notes \| Fair value, Level 2 inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Senior notes, Estimated fair value (Level 2)	$ 237,750	$ 257,000

PARTNERS' CAPITAL - Partners' Capital and Schedule of Units (Details)	3 Months Ended
	Mar. 31, 2016 shares
Rollforwards of the number of partner units
Units, beginning balance	67,827,194
Net units issued under SMLP LTIP	114,741
Subordinated unit conversion	0
Units, ending balance	67,941,935
Common
Rollforwards of the number of partner units
Units, beginning balance	42,062,644
Net units issued under SMLP LTIP	114,741
Subordinated unit conversion	(24,409,850)
Units, ending balance	66,587,235
Subordinated
Rollforwards of the number of partner units
Units, beginning balance	24,409,850
Net units issued under SMLP LTIP	0
Subordinated unit conversion	(24,409,850)
Units, ending balance	0
General partner
Rollforwards of the number of partner units
Units, beginning balance	1,354,700
Net units issued under SMLP LTIP	0
Subordinated unit conversion	0
Units, ending balance	1,354,700

PARTNERS' CAPITAL - Subordination (Details)	3 Months Ended
PARTNERS' CAPITAL - Subordination (Details)	Mar. 31, 2016
Subordinated units
Schedule of Partners' Capital [Line Items]
Common unit per subordinated unit upon conversion at end of subordination period	1

PARTNERS' CAPITAL - 2016 Drop Down (Details) - Drop Down Assets 2016 Acquisition - USD ($) $ in Thousands	Mar. 03, 2016	Mar. 31, 2016
Subsidiary or Equity Method Investee [Line Items]
Cash consideration	$ 360,000
Deferred purchase price obligation	507,427	$ 514,900
Net investment	$ 1,114,855

PARTNERS' CAPITAL - Calculation of the capital distribution and its allocation (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 03, 2016	Mar. 31, 2016	Mar. 31, 2015
Subsidiary or Equity Method Investee [Line Items]
Excess of acquired carrying value over consideration paid and recognized		$ 247,428	$ 0
Drop Down Assets 2016 Acquisition
Subsidiary or Equity Method Investee [Line Items]
Summit Investments' net investment in the 2016 Drop Down Assets	$ 771,929
SMP Holdings borrowings allocated to 2016 Drop Down Assets and retained by Summit Investments	(342,926)
Acquired carrying value of 2016 Drop Down Assets	1,114,855
Deferred purchase price obligation	507,427	514,900
Borrowings under revolving credit facility	360,000
Total consideration paid and recognized by SMLP	867,427
Excess of acquired carrying value over consideration paid and recognized	247,428
General partner
Subsidiary or Equity Method Investee [Line Items]
Excess of acquired carrying value over consideration paid and recognized	4,942	4,942
Limited partners, Common
Subsidiary or Equity Method Investee [Line Items]
Excess of acquired carrying value over consideration paid and recognized	242,486	242,486
Summit Investments' equity in contributed subsidiaries
Subsidiary or Equity Method Investee [Line Items]
Excess of acquired carrying value over consideration paid and recognized	$ 247,428	$ (247,428)

PARTNERS' CAPITAL - Cash Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Apr. 21, 2016	Mar. 31, 2016	Mar. 31, 2015
Distribution Made to Limited Partner [Line Items]
Per-unit distribution (in dollars per unit)		$ 0.575	$ 0.560
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Per-unit distribution (in dollars per unit)	$ 0.575
Cash declared to unit holders	$ 41.0
Marginal percentage	25.00%

PARTNERS' CAPITAL - Partnership Target Distributions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Partnership Target Distributions [Line Items]
IDR payments	$ 1,935	$ 1,442
General partner
Schedule of Partnership Target Distributions [Line Items]
Quarterly distributions per unit, incentive threshold	$ 0.46
General partner \| Maximum
Schedule of Partnership Target Distributions [Line Items]
Percentage interest in distributions in excess of incentive threshold	50.00%

EARNINGS PER UNIT (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss) income attributable to limited partners	$ (8,264)	$ 99
Phantom Units
(Loss) earnings per limited partner unit:
Antidilutive securities excluded from the calculation of diluted loss per common unit (in unit)	496,959	8,524
Common units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss) income attributable to limited partners	$ (8,264)	$ 69
Weighted-average units outstanding - basic	66,493,000	34,439,000
Effect of nonvested phantom units	0	146,000
Weighted-average units outstanding – diluted	66,493,000	34,585,000
(Loss) earnings per limited partner unit:
Basic (in dollars per share)	$ (0.12)	$ 0.00
Diluted (in dollars per share)	$ (0.12)	$ 0.00
Subordinated Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net (loss) income attributable to limited partners		$ 30
Weighted-average units outstanding - basic		24,410,000
Weighted-average units outstanding – diluted		24,410,000
(Loss) earnings per limited partner unit:
Basic (in dollars per share)		$ 0.00
Diluted (in dollars per share)		$ 0.00

UNIT-BASED AND NONCASH COMPENSATION - SMLP Long-Term Incentive Plan (Details) - SMLP LTIP	1 Months Ended
	Mar. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units available for future issuance	3,900,000
Phantom Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted	488,482
Grant date fair value (in dollars per share) \| $ / shares	$ 14.82
Award vesting period	3 years
Unit vested	120,920

UNIT-BASED AND NONCASH COMPENSATION - SMP Net Profits Interests (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation	$ 1,761	$ 1,312
SMP Net Profits Interests
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percent of membership interests	7.50%
Summit Investments' equity in contributed subsidiaries \| SMP Net Profits Interests \| General and administrative expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unit-based compensation	$ 195	$ 251

RELATED-PARTY TRANSACTIONS (Details) - General partner - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Operation and maintenance expense
RELATED-PARTY TRANSACTIONS
Expenses from transactions with related party	$ 6,749	$ 6,474
General and administrative expense
RELATED-PARTY TRANSACTIONS
Expenses from transactions with related party	$ 7,778	$ 7,135

COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)		3 Months Ended
	Jun. 19, 2015	Mar. 31, 2016	Mar. 31, 2015
Loss Contingencies [Line Items]
Rent expense		$ 616,000	$ 506,000
Meadowland Midstream Gathering System \| Principal Owner \| Maximum
Loss Contingencies [Line Items]
Pollution liability policy maximum coverage		25,000,000.0
Property and business interruption policy maximum coverage		$ 200,000,000.0
North Dakota Industrial Commission Case \| Meadowland Midstream Gathering System \| Principal Owner
Loss Contingencies [Line Items]
Litigation damages south by plaintiff	$ 2,500,000

COMMITMENTS AND CONTINGENCIES - Accrual for Environmental Loss Contingencies (Details) - Meadowlark Midstream Water Gathering System - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]
Accrued environmental remediation at beginning of period	$ 13,664	$ 30,000
Payments made by affiliates	(1,213)	(13,136)
Payments made with proceeds from insurance policies		(25,000)
Additional accruals		21,800
Accrued environmental remediation at end of period	$ 12,451	$ 13,664

ACQUISITIONS AND DROP DOWN TRANSACTIONS - 2016 Drop Down (Details) $ in Thousands		3 Months Ended
	Mar. 03, 2016 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)
Transactions Under Common Control [Line Items]
Deferred purchase price obligation expense		$ 7,463	$ 0
Drop Down Assets 2016 Acquisition
Transactions Under Common Control [Line Items]
Cash consideration	$ 360,000
Deferred payment multiple	6.5
Estimated future payment obligation	$ 860,300
Deferred purchase price obligation	$ 507,427	514,900
Discount rate	13.00%
Deferred purchase price obligation expense		$ 7,500

ACQUISITIONS AND DROP DOWN TRANSACTIONS - Summit Utica (Details) $ in Millions	Dec. 15, 2014 USD ($)
Principal Owner \| Utica Shale Play
Business Acquisition [Line Items]
Purchase price assigned to Meadowlark Midstream	$ 25.2

ACQUISITIONS AND DROP DOWN TRANSACTIONS - Fair Value of Assets Acquired and Liabilities Assumed (Details) - Principal Owner - Meadowlark Midstream Company, LLC $ in Thousands	Feb. 15, 2013 USD ($)
Business Acquisition [Line Items]
Purchase price assigned to Meadowlark Midstream	$ 25,376
Current assets	2,227
Property, plant, and equipment	18,795
Other noncurrent assets	4,354
Total assets acquired	25,376
Total liabilities assumed	0
Net identifiable assets acquired	$ 25,376

ACQUISITIONS AND DROP DOWN TRANSACTIONS - Supplemental Disclosures As-If Pooled Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Revenues	$ 90,571	$ 86,087
Net loss	(3,665)	(2,485)
Summit Midstream Partners, LP
Business Acquisition [Line Items]
Revenues	81,704	72,635
Net loss	(6,410)	1,667
Drop Down Assets 2016 Acquisition
Business Acquisition [Line Items]
Revenues	8,867	4,870
Net loss	$ 2,745	(7,498)
Polar Midstream and Divide
Business Acquisition [Line Items]
Revenues		8,582
Net loss		$ 3,346