10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

þ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2017

Or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from             to       

Commission file number: 001-35753

WESTERN GAS EQUITY PARTNERS, LP

(Exact name of registrant as specified in its charter)

Delaware	46-0967367
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
1201 Lake Robbins Drive The Woodlands, Texas	77380
(Address of principal executive offices)	(Zip Code)

(832) 636-6000

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  þ    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  þ    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer þ	Accelerated filer ¨	Non-accelerated filer ¨	Smaller reporting company ¨	Emerging growth company ¨
		(Do not check if a smaller reporting company)

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  þ

There were 218,933,141 common units outstanding as of October 30, 2017.

TABLE OF CONTENTS

			PAGE
PART I		FINANCIAL INFORMATION (UNAUDITED)
	Item 1.	Financial Statements
		Consolidated Statements of Operations for the three and nine months ended September 30, 2017 and 2016	6
		Consolidated Balance Sheets as of September 30, 2017, and December 31, 2016	7
		Consolidated Statement of Equity and Partners’ Capital for the nine months ended September 30, 2017	8
		Consolidated Statements of Cash Flows for the nine months ended September 30, 2017 and 2016	9
		Notes to Consolidated Financial Statements	10
		Note 1. Description of Business and Basis of Presentation	10
		Note 2. Acquisitions and Divestitures	15
		Note 3. Partnership Distributions	17
		Note 4. Equity and Partners’ Capital	19
		Note 5. Transactions with Affiliates	21
		Note 6. Property, Plant and Equipment	26
		Note 7. Equity Investments	27
		Note 8. Components of Working Capital	28
		Note 9. Debt and Interest Expense	29
		Note 10. Commitments and Contingencies	30
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31
		Cautionary Note Regarding Forward-Looking Statements	31
		Executive Summary	33
		Acquisitions and Divestitures	35
		Equity Offerings	36
		Items Affecting the Comparability of Financial Results	36
		Results of Operations	39
		Operating Results	39
		Key Performance Metrics	46
		Liquidity and Capital Resources	52
		Contractual Obligations	56
		Off-Balance Sheet Arrangements	57
		Recent Accounting Developments	57
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	57
	Item 4.	Controls and Procedures	58
PART II		OTHER INFORMATION
	Item 1.	Legal Proceedings	58
	Item 1A.	Risk Factors	58
	Item 6.	Exhibits	59

2

COMMONLY USED TERMS AND DEFINITIONS

Western Gas Equity Partners, LP (“WGP”) is a Delaware master limited partnership formed by Anadarko Petroleum Corporation to own three types of partnership interests in Western Gas Partners, LP and its subsidiaries (“WES”). For purposes of this Form 10-Q, “WGP,” “we,” “us,” “our,” “Western Gas Equity Partners,” or like terms refers to Western Gas Equity Partners, LP in its individual capacity or to Western Gas Equity Partners, LP and its subsidiaries, including the general partner of WES, Western Gas Holdings, LLC, and WES, as the context requires. As used in this Form 10-Q, the identified terms and definitions below have the following meanings:

Additional DBJV System Interest: WES’s additional 50% interest in the DBJV system acquired from a third party in March 2017.

Affiliates: Subsidiaries of Anadarko, excluding us, but including equity interests in Fort Union, White Cliffs, Rendezvous, the Mont Belvieu JV, TEP, TEG, and FRP.

Anadarko: Anadarko Petroleum Corporation and its subsidiaries, excluding us and WGP GP.

Barrel or Bbl: 42 U.S. gallons measured at 60 degrees Fahrenheit.

Bbls/d: Barrels per day.

Board of Directors or Board: The board of directors of WGP GP.

Btu: British thermal unit; the approximate amount of heat required to raise the temperature of one pound of water by one degree Fahrenheit.

Chipeta: Chipeta Processing, LLC.

Condensate: A natural gas liquid with a low vapor pressure mainly composed of propane, butane, pentane and heavier hydrocarbon fractions.

COP: Continuous offering programs.

Cryogenic: The process in which liquefied gases are used to bring natural gas volumes to very low temperatures (below approximately -238 degrees Fahrenheit) to separate natural gas liquids from natural gas. Through cryogenic processing, more natural gas liquids are extracted than when traditional refrigeration methods are used.

DBJV: Delaware Basin JV Gathering LLC.

DBJV system: A gathering system and related facilities located in the Delaware Basin in Loving, Ward, Winkler and Reeves Counties in West Texas.

DBM: Delaware Basin Midstream, LLC.

DBM complex: The cryogenic processing plants, gas gathering system, and related facilities and equipment in West Texas that serve production from Reeves, Loving and Culberson Counties, Texas and Eddy and Lea Counties, New Mexico.

DBM water systems: Two produced-water disposal systems in West Texas.

DJ Basin complex: The Platte Valley system, Wattenberg system and Lancaster plant, all of which were combined into a single complex in the first quarter of 2014.

EBITDA: Earnings before interest, taxes, depreciation, and amortization. For a definition of “Adjusted EBITDA,” see the caption Key Performance Metrics under Part I, Item 2 of this Form 10-Q.

Equity investment throughput: WES’s 14.81% share of average Fort Union throughput, 22% share of average Rendezvous throughput, 10% share of average White Cliffs throughput, 25% share of average Mont Belvieu JV throughput, 20% share of average TEP and TEG throughput and 33.33% share of average FRP throughput.

Exchange Act: The Securities Exchange Act of 1934, as amended.

3

Fort Union: Fort Union Gas Gathering, LLC.

Fractionation: The process of applying various levels of higher pressure and lower temperature to separate a stream of natural gas liquids into ethane, propane, normal butane, isobutane and natural gasoline for end-use sale.

FRP: Front Range Pipeline LLC.

GAAP: Generally accepted accounting principles in the United States.

Hydraulic fracturing: The injection of fluids into the wellbore to create fractures in rock formations, stimulating the production of oil or gas.

Imbalance: Imbalances result from (i) differences between gas and NGL volumes nominated by customers and gas and NGL volumes received from those customers and (ii) differences between gas and NGL volumes received from customers and gas and NGL volumes delivered to those customers.

IPO: Initial public offering.

LIBOR: London Interbank Offered Rate.

Marcellus Interest: WES’s 33.75% interest in the Larry’s Creek, Seely and Warrensville gas gathering systems and related facilities located in northern Pennsylvania. Formerly defined as the “Anadarko-Operated Marcellus Interest”.

MBbls/d: One thousand barrels per day.

MGR: Mountain Gas Resources, LLC.

MGR assets: The Red Desert complex and the Granger straddle plant.

MLP: Master limited partnership.

MMBtu: One million British thermal units.

MMcf: One million cubic feet.

MMcf/d: One million cubic feet per day.

Mont Belvieu JV: Enterprise EF78 LLC.

Natural gas liquid(s) or NGL(s): The combination of ethane, propane, normal butane, isobutane and natural gasolines that, when removed from natural gas, become liquid under various levels of higher pressure and lower temperature.

Non-Operated Marcellus Interest: The 33.75% interest in the Liberty and Rome gas gathering systems and related facilities located in northern Pennsylvania that was transferred to a third party in March 2017 pursuant to the Property Exchange.

Produced water: Byproduct associated with the production of crude oil and natural gas that often contains a number of dissolved solids and other materials found in oil and gas reservoirs.

Property Exchange: WES’s acquisition of the Additional DBJV System Interest from a third party in exchange for the Non-Operated Marcellus Interest and $155.0 million of cash consideration, as further described in our Forms 8-K filed with the SEC on February 9, 2017, and March 23, 2017.

Red Desert complex: The Patrick Draw processing plant, the Red Desert processing plant, associated gathering lines, and related facilities.

Rendezvous: Rendezvous Gas Services, LLC.

Residue: The natural gas remaining after the unprocessed natural gas stream has been processed or treated.

4

SEC: U.S. Securities and Exchange Commission.

Springfield: Springfield Pipeline LLC.

Springfield interest: Springfield’s 50.1% interest in the Springfield system.

Springfield gas gathering system: A gas gathering system and related facilities located in Dimmit, La Salle, Maverick and Webb Counties in South Texas.

Springfield oil gathering system: An oil gathering system and related facilities located in Dimmit, La Salle, Maverick and Webb Counties in South Texas.

Springfield system: The Springfield gas gathering system and Springfield oil gathering system.

TEFR Interests: The interests in TEP, TEG and FRP.

TEG: Texas Express Gathering LLC.

TEP: Texas Express Pipeline LLC.

TEUs: 7.50% Tangible equity units.

WES: Western Gas Partners, LP.

WES GP: Western Gas Holdings, LLC, the general partner of WES.

WES RCF: WES’s senior unsecured revolving credit facility.

WGP: Western Gas Equity Partners, LP.

WGP GP or general partner: Western Gas Equity Holdings, LLC, the general partner of WGP.

WGP RCF: The WGP senior secured revolving credit facility.

WGP LTIP: Western Gas Equity Partners, LP 2012 Long-Term Incentive Plan.

WGP WCF: The WGP working capital facility.

White Cliffs: White Cliffs Pipeline, LLC.

2018 Notes: WES’s 2.600% Senior Notes due 2018.

2021 Notes: WES’s 5.375% Senior Notes due 2021.

2022 Notes: WES’s 4.000% Senior Notes due 2022.

2025 Notes: WES’s 3.950% Senior Notes due 2025.

2026 Notes: WES’s 4.650% Senior Notes due 2026.

2044 Notes: WES’s 5.450% Senior Notes due 2044.

$500.0 million COP: WES’s COP contemplated by the registration statement filed with the SEC in July 2017 authorizing the issuance of up to an aggregate of $500.0 million of WES common units.

5

PART I.FINANCIAL INFORMATION (UNAUDITED)

Item 1.Financial Statements

WESTERN GAS EQUITY PARTNERS, LP

CONSOLIDATED STATEMENTS OF OPERATIONS

(UNAUDITED)

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except per-unit amounts	2017			2016			2017			2016
Revenues and other – affiliates
Gathering, processing and transportation	$	157,303		$	189,465		$	484,601		$	563,916
Natural gas and natural gas liquids sales	185,002			135,847			489,172			336,385
Other	8,822			—			8,822			—
Total revenues and other – affiliates	351,127			325,312			982,595			900,301
Revenues and other – third parties
Gathering, processing and transportation	148,884			125,727			428,835			346,416
Natural gas and natural gas liquids sales	74,139			28,189			201,318			43,200
Other	545			2,417			3,590			3,533
Total revenues and other – third parties	223,568			156,333			633,743			393,149
Total revenues and other	574,695			481,645			1,616,338			1,293,450
Equity income, net – affiliates	21,519			20,294			62,708			56,801
Operating expenses
Cost of product (1)	239,223			145,643			631,859			326,959
Operation and maintenance (1)	79,536			74,755			229,444			226,141
General and administrative (1)	12,922			12,112			37,595			36,514
Property and other taxes	11,215			10,670			35,433			33,113
Depreciation and amortization	72,539			67,246			216,272			199,646
Impairments	2,159			2,392			170,079			11,313
Total operating expenses	417,594			312,818			1,320,682			833,686
Gain (loss) on divestiture and other, net	72			(6,230		)	135,017			(8,769		)
Proceeds from business interruption insurance claims	—			13,667			29,882			16,270
Operating income (loss)	178,692			196,558			523,263			524,066
Interest income – affiliates	4,225			4,225			12,675			12,675
Interest expense (2)	(36,117		)	(31,301		)	(108,447		)	(76,869		)
Other income (expense), net	311			165			1,029			270
Income (loss) before income taxes	147,111			169,647			428,520			460,142
Income tax (benefit) expense	510			472			4,905			7,431
Net income (loss)	146,601			169,175			423,615			452,711
Net income (loss) attributable to noncontrolling interests	50,399			77,778			146,529			190,635
Net income (loss) attributable to Western Gas Equity Partners, LP	$	96,202		$	91,397		$	277,086		$	262,076
Limited partners’ interest in net income (loss):
Net income (loss) attributable to Western Gas Equity Partners, LP	$	96,202		$	91,397		$	277,086		$	262,076
Pre-acquisition net (income) loss allocated to Anadarko	—			—			—			(11,326		)
Limited partners’ interest in net income (loss) (3)	96,202			91,397			277,086			250,750
Net income (loss) per common unit – basic and diluted	$	0.44		$	0.42		$	1.27		$	1.15
Weighted-average common units outstanding – basic and diluted	218,933			218,922			218,931			218,921

⁽¹⁾  Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.9 million and $60.5 million for the three and nine months ended September 30, 2017, respectively, and $21.3 million and $68.0 million for the three and nine months ended September 30, 2016, respectively. Operation and maintenance includes charges from Anadarko of $18.1 million and $53.7 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $50.7 million for the three and nine months ended September 30, 2016, respectively. General and administrative includes charges from Anadarko of $10.4 million and $29.6 million for the three and nine months ended September 30, 2017, respectively, and $9.7 million and $28.2 million for the three and nine months ended September 30, 2016, respectively. See Note 5.

⁽²⁾  Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $1.2 million and $12.1 million for the three and nine months ended September 30, 2016, respectively. See Note 2 and Note 9.

⁽³⁾  Represents net income (loss) earned on and subsequent to the date of acquisition of WES assets (as defined in Note 1). See Note 4.

See accompanying Notes to Consolidated Financial Statements.

6

WESTERN GAS EQUITY PARTNERS, LP

CONSOLIDATED BALANCE SHEETS

(UNAUDITED)

thousands except number of units	September 30,   2017		December 31,   2016
ASSETS
Current assets
Cash and cash equivalents	$	153,036	$	359,072
Accounts receivable, net (1)	192,437		223,021
Other current assets	13,497		13,498
Total current assets	358,970		595,591
Note receivable – Anadarko	260,000		260,000
Property, plant and equipment
Cost	7,582,178		6,861,942
Less accumulated depreciation	2,074,464		1,812,010
Net property, plant and equipment	5,507,714		5,049,932
Goodwill	417,610		417,610
Other intangible assets	782,376		803,698
Equity investments	573,622		594,208
Other assets	15,627		15,058
Total assets	$	7,915,919	$	7,736,097
LIABILITIES, EQUITY AND PARTNERS’ CAPITAL
Current liabilities
Accounts and imbalance payables (2)	$	302,848	$	247,076
Accrued ad valorem taxes	33,020		23,121
Accrued liabilities (3)	57,699		45,190
Total current liabilities	393,567		315,387
Long-term debt	3,371,886		3,119,461
Deferred income taxes	10,284		6,402
Asset retirement obligations and other	146,248		142,641
Deferred purchase price obligation – Anadarko (4)	—		41,440
Total long-term liabilities	3,528,418		3,309,944
Total liabilities	3,921,985		3,625,331
Equity and partners’ capital
Common units (218,933,141 and 218,928,570 units issued and outstanding at September 30, 2017, and December 31, 2016, respectively)	1,067,269		1,048,143
Total partners’ capital	1,067,269		1,048,143
Noncontrolling interests	2,926,665		3,062,623
Total equity and partners’ capital	3,993,934		4,110,766
Total liabilities, equity and partners’ capital	$	7,915,919	$	7,736,097

⁽¹⁾  Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $78.3 million and $76.4 million as of September 30, 2017, and December 31, 2016, respectively. Accounts receivable, net as of December 31, 2016, also includes an insurance claim receivable related to an incident at the DBM complex. See Note 1.

⁽²⁾  Accounts and imbalance payables includes affiliate amounts of $0.2 millionand zero as of September 30, 2017, and December 31, 2016, respectively.

⁽³⁾  Accrued liabilities includes affiliate amounts of $0.3 millionand zero as of September 30, 2017, and December 31, 2016, respectively.

⁽⁴⁾  See Note 2.

See accompanying Notes to Consolidated Financial Statements.

7

WESTERN GAS EQUITY PARTNERS, LP

CONSOLIDATED STATEMENT OF EQUITY AND PARTNERS’ CAPITAL

(UNAUDITED)

	Partners’ Capital
thousands	Net Investment by Anadarko			Common Units			Noncontrolling Interests			Total
Balance at December 31, 2016	$	—		$	1,048,143		$	3,062,623		$	4,110,766
Net income (loss)	—			277,086			146,529			423,615
Above-market component of swap agreements with Anadarko (1)	—			46,719			—			46,719
WES equity transactions, net (2)	—			10,800			(10,983		)	(183		)
Distributions to Chipeta noncontrolling interest owner	—			—			(9,049		)	(9,049		)
Distributions to noncontrolling interest owners of WES	—			—			(262,888		)	(262,888		)
Distributions to WGP unitholders	—			(324,290		)	—			(324,290		)
Acquisitions from affiliates	(30		)	30			—			—
Revision to Deferred purchase price obligation – Anadarko (3)	—			4,165			—			4,165
Contributions of equity-based compensation to WES by Anadarko	—			3,333			—			3,333
Net pre-acquisition contributions from (distributions to) Anadarko	30			—			—			30
Net contributions from (distributions to) Anadarko of other assets	—			1,373			—			1,373
Other	—			(90		)	433			343
Balance at September 30, 2017	$	—		$	1,067,269		$	2,926,665		$	3,993,934

⁽¹⁾  See Note 5.

⁽²⁾  Includes the impact of WES’s (as defined in Note 1) equity offerings as described in Note 4. The $10.8 millionincrease to partners’ capital, together with net income (loss) attributable to Western Gas Equity Partners, LP, totaled $287.9 million for the nine months ended September 30, 2017.

⁽³⁾  See Note 2.

See accompanying Notes to Consolidated Financial Statements.

8

WESTERN GAS EQUITY PARTNERS, LP

CONSOLIDATED STATEMENTS OF CASH FLOWS

(UNAUDITED)

	Nine Months Ended September 30,
thousands	2017			2016
Cash flows from operating activities
Net income (loss)	$	423,615		$	452,711
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	216,272			199,646
Impairments	170,079			11,313
Non-cash equity-based compensation expense	3,751			3,759
Deferred income taxes	3,882			2,321
Accretion and amortization of long-term obligations, net	3,701			(8,820		)
Equity income, net – affiliates	(62,708		)	(56,801		)
Distributions from equity investment earnings – affiliates	64,313			59,671
(Gain) loss on divestiture and other, net	(135,017		)	8,769
Lower of cost or market inventory adjustments	140			41
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net	(47,137		)	(41,266		)
Increase (decrease) in accounts and imbalance payables and accrued liabilities, net	4,127			24,227
Change in other items, net	(2,549		)	(871		)
Net cash provided by operating activities	642,469			654,700
Cash flows from investing activities
Capital expenditures	(419,193		)	(372,725		)
Contributions in aid of construction costs from affiliates	1,386			4,927
Acquisitions from affiliates	(3,910		)	(716,465		)
Acquisitions from third parties	(155,298		)	—
Investments in equity affiliates	(384		)	139
Distributions from equity investments in excess of cumulative earnings – affiliates	16,255			16,592
Proceeds from the sale of assets to affiliates	—			623
Proceeds from the sale of assets to third parties	23,370			7,819
Proceeds from property insurance claims	22,977			18,398
Net cash used in investing activities	(514,797		)	(1,040,692		)
Cash flows from financing activities
Borrowings, net of debt issuance costs	249,989			1,120,580
Repayments of debt	—			(880,000		)
Settlement of the Deferred purchase price obligation – Anadarko (1)	(37,346		)	—
Increase (decrease) in outstanding checks	3,310			(1,070		)
Proceeds from the issuance of WES common units, net of offering expenses	(183		)	—
Proceeds from the issuance of WES Series A Preferred units, net of offering expenses	—			686,937
Distributions to WGP unitholders (2)	(324,290		)	(276,114		)
Distributions to Chipeta noncontrolling interest owner	(9,049		)	(11,257		)
Distributions to noncontrolling interest owners of WES	(262,888		)	(211,877		)
Net contributions from (distributions to) Anadarko	30			(29,335		)
Above-market component of swap agreements with Anadarko (2)	46,719			34,782
Net cash provided by (used in) financing activities	(333,708		)	432,646
Net increase (decrease) in cash and cash equivalents	(206,036		)	46,654
Cash and cash equivalents at beginning of period	359,072			99,694
Cash and cash equivalents at end of period	$	153,036		$	146,348
Supplemental disclosures
Accretion expense and revisions to the Deferred purchase price obligation – Anadarko (1)	$	(4,094	)	$	(172,249	)
Net distributions to (contributions from) Anadarko of other assets	(1,373		)	581
Interest paid, net of capitalized interest	98,956			83,352
Taxes paid	189			67
Accrued capital expenditures	165,732			49,328
Fair value of properties and equipment from non-cash third party transactions (1)	551,453			—

⁽¹⁾  See Note 2.

⁽²⁾  See Note 5.

See accompanying Notes to Consolidated Financial Statements.

9

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

General. Western Gas Equity Partners, LP is a Delaware master limited partnership (“MLP”) formed in September 2012 to own three types of partnership interests in Western Gas Partners, LP. Western Gas Equity Partners, LP was formed by converting WGR Holdings, LLC into a limited partnership and changing its name. Western Gas Partners, LP (together with its subsidiaries, “WES”) is a Delaware MLP formed by Anadarko Petroleum Corporation in 2007 to acquire, own, develop and operate midstream energy assets.

For purposes of these consolidated financial statements, “WGP” refers to Western Gas Equity Partners, LP in its individual capacity or to Western Gas Equity Partners, LP and its subsidiaries, including Western Gas Holdings, LLC and WES, as the context requires. “WES GP” refers to Western Gas Holdings, LLC, individually as the general partner of WES, and excludes WES. WGP’s general partner, Western Gas Equity Holdings, LLC (“WGP GP”), is a wholly owned subsidiary of Anadarko Petroleum Corporation. WES GP owns all of the general partner interest in WES, which constitutes substantially all of its business, which primarily is to manage the affairs and operations of WES. Refer to Note 4 for a discussion of WGP’s holdings of WES equity. “Anadarko” refers to Anadarko Petroleum Corporation and its subsidiaries, excluding WGP and WGP GP, and “affiliates” refers to subsidiaries of Anadarko, excluding WGP, but including equity interests in Fort Union Gas Gathering, LLC (“Fort Union”), White Cliffs Pipeline, LLC (“White Cliffs”), Rendezvous Gas Services, LLC (“Rendezvous”), Enterprise EF78 LLC (the “Mont Belvieu JV”), Texas Express Pipeline LLC (“TEP”), Texas Express Gathering LLC (“TEG”) and Front Range Pipeline LLC (“FRP”). The interests in TEP, TEG and FRP are referred to collectively as the “TEFR Interests.” “MGR assets” refers to the Red Desert complex and the Granger straddle plant.

WES is engaged in the business of gathering, compressing, treating, processing and transporting natural gas; gathering, stabilizing and transporting condensate, natural gas liquids (“NGLs”) and crude oil; and gathering and disposing of produced water. WES provides these midstream services for Anadarko, as well as for third-party producers and customers. As of September 30, 2017, WES’s assets and investments consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Gathering systems	12	3	3	2
Treating facilities	19	3	—	3
Natural gas processing plants/trains	19	5	—	2
NGL pipelines	2	—	—	3
Natural gas pipelines	5	—	—	—
Oil pipelines	—	1	—	1

These assets and investments are located in the Rocky Mountains (Colorado, Utah and Wyoming), North-central Pennsylvania and Texas. During the second quarter of 2017, WES commenced operation of two produced-water disposal systems in West Texas, which are included within Gathering systems in the table above. Train VI, an additional processing plant at the DBM complex, is expected to commence operations during the fourth quarter of 2017.

10

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Basis of presentation. The following table outlines WES’s ownership interests and the accounting method of consolidation used in WES’s consolidated financial statements:

	Percentage Interest
Equity investments (1)
Fort Union	14.81	%
White Cliffs	10	%
Rendezvous	22	%
Mont Belvieu JV	25	%
TEP	20	%
TEG	20	%
FRP	33.33	%
Proportionate consolidation (2)
Marcellus Interest systems	33.75	%
Newcastle system	50	%
Springfield system	50.1	%
Full consolidation
Chipeta (3)	75	%
DBJV system (4)	100	%

⁽¹⁾  Investments in non-controlled entities over which WES exercises significant influence are accounted for under the equity method. “Equity investment throughput” refers to WES’s share of average throughput for these investments.

⁽²⁾  WGP proportionately consolidates WES’s associated share of the assets, liabilities, revenues and expenses attributable to these assets.

⁽³⁾  The 25% interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interests in the consolidated financial statements, in addition to the noncontrolling interests noted below.

⁽⁴⁾  WES acquired an additional 50% interest in the DBJV system (the “Additional DBJV System Interest”) from a third party on March 17, 2017. See Note 2.

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The consolidated financial statements include the accounts of WGP and entities in which it holds a controlling financial interest, including WES and WES GP. All significant intercompany transactions have been eliminated.

Certain information and note disclosures commonly included in annual financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying consolidated financial statements and notes should be read in conjunction with WGP’s 2016 Form 10-K, as filed with the SEC on February 23, 2017. Management believes that the disclosures made are adequate to make the information not misleading.

The consolidated financial results of WES are included in WGP’s consolidated financial statements due to WGP’s 100% ownership interest in WES GP and WES GP’s control of WES. Throughout these notes to consolidated financial statements, and to the extent material, any differences between the consolidated financial results of WGP and WES are discussed separately. WGP has no independent operations or material assets other than its partnership interests in WES. WGP’s consolidated financial statements differ from those of WES primarily as a result of (i) the presentation of noncontrolling interest ownership (attributable to the limited partner interests in WES held by the public, other subsidiaries of Anadarko and private investors, see Note 4), (ii) the elimination of WES GP’s investment in WES with WES GP’s underlying capital account, (iii) the general and administrative expenses incurred by WGP, which are separate from, and in addition to, those incurred by WES, (iv) the inclusion of the impact of WGP equity balances and WGP distributions, and (v) WGP’s senior secured revolving credit facility (“WGP RCF”). See Note 9.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Variable interest entity.WES is a variable interest entity (“VIE”) because the partners in WES with equity at risk lack the power, through voting or similar rights, to direct the activities that most significantly impact WES’s economic performance. A reporting entity that concludes it has a variable interest in a VIE must evaluate whether it has a controlling financial interest in the VIE, such that it is the VIE’s primary beneficiary and should consolidate. WGP is the primary beneficiary of WES and therefore should consolidate because (i) WGP has the power to direct the activities of WES that most significantly affect its economic performance and (ii) WGP has the right to receive benefits or the obligation to absorb losses that could be potentially significant to WES. As noted above, WGP has no independent operations or material assets other than its partnership interests in WES. The assets of WES cannot be used by WGP for general partnership purposes. WES’s long-term debt is recourse to WES GP, which is wholly owned by WGP. In turn, WES GP is indemnified by wholly owned subsidiaries of Anadarko for any claims made against WES GP under the indentures governing WES’s outstanding notes or borrowings under WES’s senior unsecured revolving credit facility (“WES RCF”). WES’s sources of liquidity include cash and cash equivalents, cash flows generated from operations, interest income on its $260.0 million note receivable from Anadarko, available borrowing capacity under the WES RCF, and issuances of additional equity or debt securities. As further discussed in Note 2, WGP purchased WES common units in connection with WES’s financing of an acquisition from Anadarko in March 2016.

Noncontrolling interests. WGP’s noncontrolling interests in the consolidated financial statements consist of the following for all periods presented: (i) the 25% interest in Chipeta held by a third-party member, (ii) the publicly held limited partner interests in WES, (iii) the 2,011,380 WES common units issued by WES to other subsidiaries of Anadarko as part of the consideration paid for the acquisitions of the Non-Operated Marcellus Interest, the TEFR Interests and Springfield, and (iv) the WES Class C units issued by WES to a subsidiary of Anadarko as part of the funding for the acquisition of Delaware Basin Midstream, LLC (“DBM”). The WES Series A Preferred units issued to private investors as part of the funding of the Springfield acquisition were also noncontrolling interests in the consolidated financial statements until converted into WES common units in 2017. See Note 2 and Note 4.

When WES issues equity, the carrying amount of the noncontrolling interest reported by WGP is adjusted to reflect the noncontrolling ownership interest in WES. The resulting impact of such noncontrolling interest adjustment on WGP’s interest in WES is reflected as an adjustment to WGP’s partners’ capital.

Presentation of WES assets. The term “WES assets” includes both the assets indirectly owned and the interests accounted for under the equity method (see Note 7) by WGP through its partnership interests in WES as of September 30, 2017. Because WGP owns the entire interest in and controls WES GP, and WGP GP is owned and controlled by Anadarko, each of WES’s acquisitions of WES assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, WES assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by WES. Further, after an acquisition of WES assets from Anadarko, WES and WGP (by virtue of its consolidation of WES) may be required to recast their financial statements to include the activities of such WES assets from the date of common control.

For those periods requiring recast, the consolidated financial statements for periods prior to the acquisition of WES assets from Anadarko are prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if WES had owned the WES assets during the periods reported. Net income (loss) attributable to the WES assets acquired from Anadarko for periods prior to WES’s acquisition of the WES assets is not allocated to the limited partners.

Use of estimates. In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other methods considered reasonable. Changes in facts and circumstances or additional information may result in revised estimates and actual results may differ from these estimates. Effects on the business, financial condition and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements, and certain prior-period amounts have been reclassified to conform to the current-year presentation.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Insurance recoveries. Involuntary conversions result from the loss of an asset because of some unforeseen event (e.g., destruction due to fire). Some of these events are insurable and result in property damage insurance recovery. Amounts that are received from insurance carriers are net of any deductibles related to the covered event. A receivable is recorded from insurance to the extent a loss is recognized from an involuntary conversion event and the likelihood of recovering such loss is deemed probable. To the extent that any insurance claim receivables are later judged not probable of recovery (e.g., due to new information), such amounts are expensed. A gain on involuntary conversion is recognized when the amount received from insurance exceeds the net book value of the retired asset(s). In addition, gains related to insurance recoveries are not recognized until all contingencies related to such proceeds have been resolved, that is, a cash payment is received from the insurance carrier or there is a binding settlement agreement with the carrier that clearly states that a payment will be made. To the extent that an asset is rebuilt, the associated expenditures are capitalized, as appropriate, in the consolidated balance sheets and presented as capital expenditures in the consolidated statements of cash flows. With respect to business interruption insurance claims, income is recognized only when cash proceeds are received from insurers, which are presented in the consolidated statements of operations as a component of Operating income (loss).

On December 3, 2015, there was an initial fire and secondary explosion at the processing facility within the DBM complex. The majority of the damage from the incident was to the liquid handling facilities and the amine treating units at the inlet of the complex. Train II (with capacity of 100 MMcf/d) sustained the most damage of the processing trains and returned to service in December 2016. Train III (with capacity of 200 MMcf/d) experienced minimal damage and returned to full service in May 2016. During the quarter ended March 31, 2017, a $5.7 million loss was recorded in Gain (loss) on divestiture and other, net in the consolidated statements of operations, related to a change in WES’s estimate of the amount that would be recovered under the property insurance claim based on further discussions with insurers. During the second quarter of 2017, WES reached a settlement with insurers and final proceeds were received. As of September 30, 2017, and December 31, 2016, the consolidated balance sheets include receivables of zero and $30.0 million, respectively, for the property insurance claim related to the incident at the DBM complex. During the nine months ended September 30, 2017, WES received $52.9 million in cash proceeds from insurers in final settlement of WES’s claims related to the incident at the DBM complex, including $29.9 million in proceeds from business interruption insurance claims and $23.0 million in proceeds from property insurance claims.

Recently adopted accounting standards. Accounting Standards Update (“ASU”) 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business assists in determining whether a transaction should be accounted for as an acquisition or disposal of assets or a business. This ASU provides a screen that when substantially all of the fair value of the gross assets acquired, or disposed of, are concentrated in a single identifiable asset, or a group of similar identifiable assets, the assets will not be considered a business. If the screen is not met, the assets must include an input and a substantive process that together significantly contribute to the ability to create an output to be considered a business. WGP’s adoption of this ASU on January 1, 2017, using a prospective approach, could have a material impact on future consolidated financial statements as goodwill will not be allocated to divestitures or recorded on acquisitions that are not considered businesses.

ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs and eliminates the exception for an intra-entity transfer of an asset other than inventory. WGP adopted this ASU on January 1, 2017, using a modified retrospective approach, with no impact to its consolidated financial statements.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

New accounting standards issued but not yet adopted. ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash requires an entity to explain the changes in the total of cash, cash equivalents, restricted cash, and restricted cash equivalents on the statement of cash flows and to provide a reconciliation of the totals in that statement to the related captions in the balance sheet when the cash, cash equivalents, restricted cash, and restricted cash equivalents are presented in more than one line item on the balance sheet. This ASU is effective for annual and interim periods beginning after December 15, 2017, and is required to be adopted using a retrospective approach, with early adoption permitted. WGP will adopt this ASU on January 1, 2018, and does not expect the adoption to have a material impact on its consolidated financial statements.

ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments provides clarification on how certain cash receipts and cash payments are presented and classified on the statement of cash flows. This ASU is effective for annual and interim periods beginning after December 15, 2017, and is required to be adopted using a retrospective approach if practicable, with early adoption permitted. WGP will adopt this ASU on January 1, 2018, and does not expect the adoption to have a material impact on its consolidated statement of cash flows.

ASU 2016-02, Leases (Topic 842) requires lessees to recognize a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months on the balance sheet. The provisions of ASU 2016-02 also modify the definition of a lease and outline the requirements for recognition, measurement, presentation, and disclosure of leasing arrangements by both lessees and lessors. WGP plans to elect certain practical expedients when implementing the new lease standard, which means WGP will not have to reassess the accounting for contracts that commenced prior to adoption. WGP has preliminarily determined WES’s portfolio of leased assets and is reviewing all related contracts to determine the impact that adoption will have on its consolidated financial statements. WGP is also evaluating the impact of this ASU on its systems, processes, and internal controls. WGP will complete its evaluation in 2018 and adopt this new standard on January 1, 2019, using a modified retrospective approach for all comparative periods presented.

ASU 2014-09, Revenue from Contracts with Customers (Topic 606) supersedes current revenue recognition requirements and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. Additional disclosures will be required to describe the nature, amount, timing, and uncertainty of revenue and cash flows from contracts with customers. WGP has completed an initial review of contracts in each of its revenue streams and is developing accounting policies to address the provisions of the ASU. While WGP does not currently expect net income to be materially impacted, it has concluded that WES is acting as an agent in the sale of certain volumes on behalf of WES’s customers based on the requirements of the new ASU. This conclusion will result in the reduction of Natural gas and natural gas liquids sales revenues and a corresponding reduction to cost of product expense related to WES’s contracts with these customers. In addition, WGP expects to recognize revenue for commodities received as noncash consideration in exchange for services provided and revenue and associated cost of product expense for the subsequent sale of those same commodities. This recognition will result in an increase to revenues for gathering and processing activities and cost of product expense with no impact on net income. WGP expects to recognize additional revenues for certain customer contributions related to capital cost recoveries that were previously accounted for as a reduction to capitalized property, plant and equipment. WGP also expects changes in the timing of recognizing revenue for certain fees due to the fee structure of certain contracts. WGP continues to evaluate the impact of these and other provisions of the ASU on its accounting policies, internal controls, and consolidated financial statements. Although WGP has not finalized the quantitative impact of the new standard, based on the assessment completed to date, WGP does not expect the adoption of this standard will have a material impact on its net income. WGP will complete its evaluation during the fourth quarter of 2017 and will adopt this new standard on January 1, 2018, using the modified retrospective method with a cumulative adjustment to equity and partners’ capital.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

2.  ACQUISITIONS AND DIVESTITURES

The following table presents the acquisitions completed by WES during 2017 and 2016, and identifies the funding sources for such acquisitions:

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		WES Common Units Issued	WES Series A Preferred Units Issued
Springfield system (1)	03/14/2016	50.1	%	$	247,500	$	—	2,089,602	14,030,611
DBJV system (2)	03/17/2017	50	%	—		155,000		—	—

⁽¹⁾  WES acquired Springfield Pipeline LLC (“Springfield”) from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in an oil gathering system and a gas gathering system, such interest being referred to in this report as the “Springfield interest.” The Springfield oil and gas gathering systems (collectively, the “Springfield system”) are located in Dimmit, La Salle, Maverick and Webb Counties in South Texas. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units to private investors. See Note 4 for further information regarding WES’s Series A Preferred units. WGP financed the purchase of the WES common units by borrowing $25.0 million under the WGP RCF. See Note 9.

⁽²⁾  WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

Property exchange. On March 17, 2017, WES acquired the Additional DBJV System Interest from a third party in exchange for (a) WES’s 33.75% non-operated interest in two natural gas gathering systems located in northern Pennsylvania (the “Non-Operated Marcellus Interest”), commonly referred to as the Liberty and Rome systems, and (b) $155.0 million of cash consideration (collectively, the “Property Exchange”). WES previously held a 50% interest in, and operated, the DBJV system.

The Property Exchange is reflected as a nonmonetary transaction whereby the acquired Additional DBJV System Interest is recorded at the fair value of the divested Non-Operated Marcellus Interest plus the $155.0 million of cash consideration. The Property Exchange resulted in a net gain of $125.7 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations. Results of operations attributable to the Property Exchange were included in the consolidated statement of operations beginning on the acquisition date in the first quarter of 2017.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

2.  ACQUISITIONS AND DIVESTITURES (CONTINUED)

DBJV acquisition - Deferred purchase price obligation - Anadarko.Prior to WES’s agreement with Anadarko to settle its deferred purchase price obligation early, the consideration that would have been paid by WES for the March 2015 acquisition of Delaware Basin JV Gathering LLC (“DBJV”) from Anadarko, consisted of a cash payment to Anadarko due on March 31, 2020. The cash payment would have been equal to (a) eight multiplied by the average of WES’s share in the Net Earnings (see definition below) of DBJV for the calendar years 2018 and 2019, less (b) WES’s share of all capital expenditures incurred for DBJV between March 1, 2015, and February 29, 2020. Net Earnings was defined as all revenues less cost of product, operating expenses and property taxes, in each case attributable to DBJV on an accrual basis. In May 2017, WES reached an agreement with Anadarko to settle this obligation whereby WES made a cash payment to Anadarko of $37.3 million, equal to the estimated net present value of the obligation at March 31, 2017.

The following table summarizes the financial statement impact of the Deferred purchase price obligation - Anadarko:

	Deferred purchase price obligation - Anadarko			Estimated future payment obligation (1)
Balance at December 31, 2016	$	41,440		$	56,455
Accretion expense (2)	71
Revision to Deferred purchase price obligation – Anadarko (3)	(4,165		)
Settlement of the Deferred purchase price obligation – Anadarko	(37,346		)
Balance at September 30, 2017	$	—		$	—

⁽¹⁾  Calculated using Level 3 inputs.

⁽²⁾  Accretion expense was recorded as a charge to Interest expense in the consolidated statements of operations.

⁽³⁾  Recorded as revisions within Common units in the consolidated balance sheet and consolidated statement of equity and partners’ capital.

Helper and Clawson systems divestiture. During the second quarter of 2017, the Helper and Clawson systems, located in Utah, were sold to a third party, resulting in a net gain on sale of $16.4 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations.

Hugoton system divestiture. During the fourth quarter of 2016, the Hugoton system, located in Southwest Kansas and Oklahoma, was sold to a third party, resulting in a net loss on sale of $12.0 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations. WES allocated $1.6 million in goodwill to this divestiture.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

3.  PARTNERSHIP DISTRIBUTIONS

WGP partnership distributions. WGP’s partnership agreement requires WGP to distribute all of its available cash (as defined in its partnership agreement) to WGP unitholders of record on the applicable record date within 55 days of the end of each quarter. The Board of Directors of WGP GP (the “Board of Directors”) declared the following cash distributions to WGP unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31	$	0.42375	$	92,767	May 2016
June 30	0.43375		94,958		August 2016
September 30	0.44750		97,968		November 2016
December 31	0.46250		101,254		February 2017
2017
March 31	$	0.49125	$	107,549	May 2017
June 30	0.52750		115,487		August 2017
September 30 (1)	0.53750		117,677		November 2017

⁽¹⁾  The Board of Directors declared a cash distribution to WGP unitholders for the third quarter of 2017 of $0.53750 per unit, or $117.7 million in aggregate. The cash distribution is payable on November 22, 2017, to WGP unitholders of record at the close of business on November 2, 2017.

WES partnership distributions. WES’s partnership agreement requires WES to distribute all of its available cash (as defined in WES’s partnership agreement) to WES unitholders of record on the applicable record date within 45 days of the end of each quarter. The Board of Directors of WES GP declared the following cash distributions to WES’s common and general partner unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31	$	0.815	$	158,905	May 2016
June 30	0.830		162,827		August 2016
September 30	0.845		166,742		November 2016
December 31	0.860		170,657		February 2017
2017
March 31	$	0.875	$	188,753	May 2017
June 30	0.890		207,491		August 2017
September 30 (1)	0.905		212,038		November 2017

⁽¹⁾  The Board of Directors of WES GP declared a cash distribution to WES unitholders for the third quarter of 2017 of $0.905 per unit, or $212.0 million in aggregate, including incentive distributions, but excluding distributions on WES Class C units (see WESClass C unit distributions below). The cash distribution is payable on November 13, 2017, to WES unitholders of record at the close of business on November 2, 2017.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

3.  PARTNERSHIP DISTRIBUTIONS (CONTINUED)

WES’s available cash. The amount of available cash (as defined in WES’s partnership agreement) generally is all cash on hand at the end of the quarter, plus, at the discretion of WES GP, working capital borrowings made subsequent to the end of such quarter, less the amount of cash reserves established by WES GP to provide for the proper conduct of WES’s business, including reserves to fund future capital expenditures; to comply with applicable laws, debt instruments or other agreements; or to provide funds for distributions to WES unitholders and to WES GP for any one or more of the next four quarters. Working capital borrowings generally include borrowings made under a credit facility or similar financing arrangement. Working capital borrowings may only be those that, at the time of such borrowings, were intended to be repaid within 12 months. In all cases, working capital borrowings are used solely for working capital purposes or to fund distributions to partners.

WES Class C unit distributions. WES’s Class C units receive quarterly distributions at a rate equivalent to WES’s common units. The distributions are paid in the form of additional Class C units (“PIK Class C units”) until the scheduled conversion date on March 1, 2020 (unless earlier converted), and the Class C units are disregarded with respect to WES’s distributions of WES’s available cash until they are converted to WES common units. The number of additional PIK Class C units to be issued in connection with a distribution payable on the Class C units is determined by dividing the corresponding distribution attributable to the Class C units by the volume-weighted-average price of WES’s common units for the ten days immediately preceding the payment date for the WES common unit distribution, less a 6% discount. WES records the PIK Class C unit distributions at fair value at the time of issuance. This Level 2 fair value measurement uses WES’s unit price as a significant input in the determination of the fair value. See Note 4 for further discussion of the WES Class C units.

WES Series A Preferred unit distributions. As further described in Note 4, WES issued Series A Preferred units representing limited partner interests in WES to private investors in 2016. The Series A Preferred unitholders received quarterly distributions in cash equal to $0.68 per Series A Preferred unit, subject to certain adjustments. The following table summarizes the Series A Preferred unitholders’ cash distributions for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31 (1)	$	0.68	$	1,887	May 2016
June 30 (2)	0.68		14,082		August 2016
September 30	0.68		14,907		November 2016
December 31	0.68		14,908		February 2017
2017
March 31	$	0.68	$	7,453	May 2017

⁽¹⁾  Quarterly per unit distribution prorated for the 18-day period during which 14,030,611 WES Series A Preferred units were outstanding during the first quarter of 2016.

⁽²⁾  Full quarterly per unit distribution on 14,030,611 WES Series A Preferred units and quarterly per unit distribution prorated for the 77-day period during which 7,892,220 WES Series A Preferred units were outstanding during the second quarter of 2016.

On March 1, 2017, 50% of the outstanding WES Series A Preferred units converted into WES common units on a one-for-one basis, and on May 2, 2017, the remaining WES Series A Preferred units converted into WES common units on a one-for-one basis. Such converted WES common units were entitled to distributions made to WES common unitholders with respect to the quarter during which the applicable conversion occurred and did not include a prorated WES Series A Preferred unit distribution.

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

3.  PARTNERSHIP DISTRIBUTIONS (CONTINUED)

WES’s general partner interest and incentive distribution rights. As of September 30, 2017, WES GP was entitled to 1.5% of all quarterly distributions that WES makes prior to its liquidation and, as the holder of the incentive distribution rights (“IDRs”), was entitled to incentive distributions at the maximum distribution sharing percentage of 48.0% for all periods presented, after the minimum quarterly distribution and the target distribution levels had been achieved. The maximum distribution sharing percentage of 49.5% does not include any distributions that WES GP may receive on common units that it may acquire.

4.  EQUITY AND PARTNERS’ CAPITAL

Holdings of WGP equity. WGP’s common units are listed on the New York Stock Exchange under the symbol “WGP.” As of September 30, 2017, Anadarko held 178,587,365 of WGP’s common units, representing an 81.6% limited partner interest in WGP, and, through its ownership of WGP GP, Anadarko indirectly held the entire non-economic general partner interest in WGP. The public held 40,345,776 WGP common units, representing an 18.4% limited partner interest in WGP.

In June 2016, Anadarko sold 12,500,000 of its WGP common units to the public through an underwritten offering. WGP did not receive any proceeds from, or incur any expense in, the public offering.

Tangible equity units. In June 2015, Anadarko completed the public issuance of 9,200,0007.50% tangible equity units (“TEUs”), including 1,200,000 TEUs pursuant to the full exercise of the underwriters’ over-allotment option, at a price to the public of $50.00 per TEU. Each TEU that Anadarko issued consists of (1) a prepaid equity purchase contract for WGP common units owned by Anadarko (subject to Anadarko’s right to elect to deliver shares of its common stock in lieu of such WGP common units) and (2) a senior amortizing note due June 7, 2018. WGP did not receive any proceeds from, or incur any expense in, the public offering.

Net income (loss) per common unit. For WGP, basic net income (loss) per common unit is calculated by dividing the limited partners’ interest in net income (loss) by the weighted-average number of common units outstanding during the period. Dilutive net income (loss) per common unit is calculated by dividing the limited partners’ interest in net income (loss) adjusted for distributions on the WES Series A Preferred units and a reallocation of the limited partners’ interest in net income (loss) assuming conversion of the WES Series A Preferred units into WES common units by the weighted-average number of WGP common units outstanding during the period. As of May 2, 2017, all WES Series A Preferred units were converted into WES common units on a one-for-one basis. The impact of the Series A Preferred units assuming conversion to WES common units would be anti-dilutive for all periods presented. Net income (loss) per common unit is calculated assuming that cash distributions are equal to the net income attributable to WGP. Net income (loss) attributable to the WES assets (as defined in Note 1) acquired from Anadarko for periods prior to WES’s acquisition of the WES assets is not allocated to the limited partners when calculating net income (loss) per common unit. Net income equal to the amount of available cash (as defined by WGP’s partnership agreement) is allocated to WGP common unitholders consistent with actual cash distributions.

Holdings of WES equity. As of September 30, 2017, WGP held 50,132,046 WES common units, representing a 29.8% limited partner interest in WES, and, through its ownership of WES GP, WGP indirectly held 2,583,068 general partner units, representing a 1.5% general partner interest in WES, and 100% of WES’s incentive distribution rights. As of September 30, 2017, (i) other subsidiaries of Anadarko collectively held 2,011,380 WES common units and 12,977,633 Class C units, representing an aggregate 9.0% limited partner interest in WES and (ii) the public held 100,458,679 WES common units, representing a 59.7% limited partner interest in WES, which are all reflected as noncontrolling interests within the consolidated financial statements of WGP (see Note 1 and Note 2).

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WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

4.  EQUITY AND PARTNERS’ CAPITAL (CONTINUED)

WES Class C units. In November 2014, WES issued 10,913,853 Class C units to Anadarko Midstream Holdings (“AMH”), pursuant to a Unit Purchase Agreement with Anadarko and AMH. The Class C units were issued to partially fund WES’s acquisition of DBM.

When issued, the WES Class C units were scheduled to convert into WES common units on a one-for-one basis on December 31, 2017. In February 2017, Anadarko elected to extend the conversion date of the WES Class C units to March 1, 2020. WES can elect to convert the Class C units earlier or Anadarko can extend the conversion date again.

WES Series A Preferred units. In 2016, WES issued 21,922,831 WES Series A Preferred units to private investors. Pursuant to an agreement between WES and the holders of the WES Series A Preferred units, 50% of the WES Series A Preferred units converted into WES common units on a one-for-one basis on March 1, 2017, and the remaining Series A Preferred units converted on a one-for-one basis on May 2, 2017. WES has an effective registration statement with the SEC relating to the public resale of the WES common units issued upon conversion of the WES Series A Preferred units.

WES interests. The following table summarizes WES’s common, Class C, Series A Preferred and general partner units issued during the nine months ended September 30, 2017:

	WES Common Units	WES Class C Units	WES Series A Preferred Units		WES General Partner Units	Total
Balance at December 31, 2016	130,671,970	12,358,123	21,922,831		2,583,068	167,535,992
PIK Class C units	—	619,510	—		—	619,510
Conversion of Series A Preferred units	21,922,831	—	(21,922,831	)	—	—
Long-Term Incentive Plan award vestings	7,304	—	—		—	7,304
Balance at September 30, 2017	152,602,105	12,977,633	—		2,583,068	168,162,806

20

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES

Affiliate transactions. Revenues from affiliates include amounts earned by WES from services provided to Anadarko as well as from the sale of residue and NGLs to Anadarko. In addition, WES purchases natural gas from an affiliate of Anadarko pursuant to gas purchase agreements. Operation and maintenance expense includes amounts accrued for or paid to affiliates for the operation of WES assets, whether in providing services to affiliates or to third parties, including field labor, measurement and analysis, and other disbursements. A portion of general and administrative expenses is paid by Anadarko, which results in affiliate transactions pursuant to the reimbursement provisions of the omnibus agreements of WES and WGP. Affiliate expenses do not bear a direct relationship to affiliate revenues, and third-party expenses do not bear a direct relationship to third-party revenues. See Note 2 for further information related to contributions of assets to WES by Anadarko.

Cash management. Anadarko operates a cash management system whereby excess cash from most of its subsidiaries’ separate bank accounts is generally swept to centralized accounts. Prior to the acquisition of WES assets, third-party sales and purchases related to such assets were received or paid in cash by Anadarko within its centralized cash management system. The outstanding affiliate balances were entirely settled through an adjustment to net investment by Anadarko in connection with the acquisition of WES assets. Subsequent to the acquisition of WES assets from Anadarko, transactions related to such assets are cash-settled directly with third parties and with Anadarko affiliates. Chipeta cash settles its transactions directly with third parties and Anadarko, as well as with the other subsidiaries of WES.

Note receivable - Anadarko. Concurrently with the closing of WES’s May 2008 initial public offering, WES loaned $260.0 million to Anadarko in exchange for a 30-year note bearing interest at a fixed annual rate of 6.50%, payable quarterly. The fair value of the note receivable from Anadarko was $313.2 million and $313.3 million at September 30, 2017, and December 31, 2016, respectively. The fair value of the note reflects consideration of credit risk and any premium or discount for the differential between the stated interest rate and quarter-end market interest rate, based on quoted market prices of similar debt instruments. Accordingly, the fair value of the note receivable from Anadarko is measured using Level 2 inputs.

WGP working capital facility.On November 1, 2012, WGP entered into a $30.0 million working capital facility (the “WGP WCF”) with Anadarko as the lender. The WGP WCF is available exclusively to fund WGP’s working capital borrowings. The WGP WCF will mature on November 1, 2017. See Note 9.

Commodity price swap agreements. WES has commodity price swap agreements with Anadarko to mitigate exposure to a majority of the commodity price risk inherent in its percent-of-proceeds and keep-whole contracts. Notional volumes for each of the commodity price swap agreements are not specifically defined. Instead, the commodity price swap agreements apply to the actual volume of natural gas, condensate and NGLs purchased and sold. The commodity price swap agreements do not satisfy the definition of a derivative financial instrument and, therefore, are not required to be measured at fair value.

21

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

The following table summarizes gains and losses upon settlement of WES’s commodity price swap agreements recognized in the consolidated statements of operations:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Gains (losses) on commodity price swap agreements related to sales: (1)
Natural gas sales	$	6,284		$	719		$	12,022		$	12,962
Natural gas liquids sales	(7,210		)	15,939			(9,680		)	56,489
Total	(926		)	16,658			2,342			69,451
Gains (losses) on commodity price swap agreements related to purchases (2)	(117		)	(9,248		)	(2,928		)	(45,032		)
Net gains (losses) on commodity price swap agreements	$	(1,043	)	$	7,410		$	(586	)	$	24,419

⁽¹⁾  Reported in affiliate Natural gas and natural gas liquids sales in the consolidated statements of operations in the period in which the related sale is recorded.

⁽²⁾  Reported in Cost of product in the consolidated statements of operations in the period in which the related purchase is recorded.

Revenues or costs attributable to volumes settled during 2016 and 2017 for the DJ Basin complex and 2017 for the MGR assets are recognized in the consolidated statements of operations at the applicable market price in the tables below. WES also records a capital contribution from Anadarko in its consolidated statement of equity and partners’ capital for the amount by which the swap price exceeds the applicable market price in the tables below. The commodity price swap agreement for the Hugoton system was in place until its divestiture in October 2016. For the nine months ended September 30, 2017, the capital contribution from Anadarko was $46.7 million. The tables below summarize the swap prices compared to the forward market prices:

	DJ Basin Complex
per barrel except natural gas	2016 - 2017 Swap Prices		2016 Market Prices (1)		2017 Market Prices (1)
Ethane	$	18.41	$	0.60	$	5.09
Propane	47.08		10.98		18.85
Isobutane	62.09		17.23		26.83
Normal butane	54.62		16.86		26.20
Natural gasoline	72.88		26.15		41.84
Condensate	76.47		34.65		45.40
Natural gas (per MMBtu)	5.96		2.11		3.05

⁽¹⁾  Represents the New York Mercantile Exchange (“NYMEX”) forward strip price as of December 8, 2015 and December 1, 2016, for the 2016 Market Prices and 2017 Market Prices, respectively, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

22

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

	MGR Assets
per barrel except natural gas	2016 - 2017 Swap Prices		2017 Market Prices (1)
Ethane	$	23.11	$	4.08
Propane	52.90		19.24
Isobutane	73.89		25.79
Normal butane	64.93		25.16
Natural gasoline	81.68		45.01
Condensate	81.68		53.55
Natural gas (per MMBtu)	4.87		3.05

⁽¹⁾  Represents the NYMEX forward strip price as of December 1, 2016, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

Gathering and processing agreements. WES has significant gathering and processing arrangements with affiliates of Anadarko on a majority of its systems. WES’s natural gas gathering, treating and transportation throughput (excluding equity investment throughput) attributable to production owned or controlled by Anadarko was 33% and 34% for the three and nine months ended September 30, 2017, respectively, and 37% and 38% for the three and nine months ended September 30, 2016, respectively. WES’s natural gas processing throughput (excluding equity investment throughput) attributable to production owned or controlled by Anadarko was 39% and 42% for the three and nine months ended September 30, 2017, respectively, and 51% and 55% for the three and nine months ended September 30, 2016, respectively. WES’s crude, NGL and produced water gathering, treating and transportation throughput (excluding equity investment throughput) attributable to production owned or controlled by Anadarko was 54% and 50% for the three and nine months ended September 30, 2017, respectively, and 67% and 64% for the three and nine months ended September 30, 2016, respectively.

Commodity purchase and sale agreements. WES sells a significant amount of its natural gas, condensate and NGLs to Anadarko Energy Services Company (“AESC”), Anadarko’s marketing affiliate. In addition, WES purchases natural gas, condensate and NGLs from AESC pursuant to purchase agreements. WES’s purchase and sale agreements with AESC are generally one-year contracts, subject to annual renewal.

Acquisitions from Anadarko. On March 14, 2016, WES acquired Springfield from Anadarko (seeNote 2).

23

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

WGP LTIP. WGP GP awards phantom units under the Western Gas Equity Partners, LP 2012 Long-Term Incentive Plan (“WGP LTIP”) to its independent directors and executive officers. The phantom units awarded to the independent directors vest one year from the grant date, while awards granted to executive officers are subject to graded vesting over a three-year service period. Compensation expense under the WGP LTIP is recognized over the vesting period and was $63,000 and $0.2 million for the three and nine months ended September 30, 2017, respectively, and $57,000 and $0.2 million for the three and nine months ended September 30, 2016, respectively.

WGP LTIP and Anadarko Incentive Plan. General and administrative expenses included $1.2 million and $3.2 million for the three and nine months ended September 30, 2017, respectively, and $1.4 million and $3.7 million for the three and nine months ended September 30, 2016, respectively, of equity-based compensation expense, allocated to WES by Anadarko, for awards granted to the executive officers of WES GP and other employees under the WGP LTIP and the Anadarko Petroleum Corporation 2012 Omnibus Incentive Compensation Plan (“Anadarko Incentive Plan”). Of this amount, $3.3 million is reflected as contributions to partners’ capital in the consolidated statement of equity and partners’ capital for the nine months ended September 30, 2017.

WES LTIP. WES GP awards phantom units under the Western Gas Partners, LP 2008 Long-Term Incentive Plan (“WES LTIP”) primarily to its independent directors, but also from time to time to its executive officers and Anadarko employees performing services for WES. The phantom units awarded to the independent directors vest one year from the grant date, while all other awards are subject to graded vesting over a three-year service period. Compensation expense is recognized over the vesting period and was $0.1 million for each of the three months ended September 30, 2017 and 2016, and $0.3 million for each of the nine months ended September 30, 2017 and 2016.

Equipment purchases and sales. The following table summarizes WES’s purchases from and sales to Anadarko of pipe and equipment:

	Nine Months Ended September 30,
	2017			2016			2017		2016
thousands	Purchases						Sales
Cash consideration	$	3,910		$	3,965		$	—	$	623
Net carrying value	(5,283		)	(3,366		)	—		(605		)
Partners’ capital adjustment	$	(1,373	)	$	599		$	—	$	18

Contributions in aid of construction costs from affiliates. On certain of WES’s capital projects, Anadarko is obligated to reimburse WES for all or a portion of project capital expenditures. The majority of such arrangements are associated with projects related to pipeline construction activities and production well tie-ins. The cash receipts resulting from such reimbursements are presented as “Contributions in aid of construction costs from affiliates” within the investing section of the consolidated statements of cash flows.

24

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

Summary of affiliate transactions. The following table summarizes material affiliate transactions. SeeNote 2 for discussion of affiliate acquisitions and related funding.

	Three Months Ended   September 30,					Nine Months Ended   September 30,
thousands	2017		2016			2017			2016
Revenues and other (1)	$	351,127	$	325,312		$	982,595		$	900,301
Equity income, net – affiliates (1)	21,519		20,294			62,708			56,801
Cost of product (1)	22,902		21,254			60,497			67,979
Operation and maintenance (2)	18,110		15,052			53,661			50,688
General and administrative (3)	10,414		9,655			29,637			28,179
Operating expenses	51,426		45,961			143,795			146,846
Interest income (4)	4,225		4,225			12,675			12,675
Interest expense (5)	—		(1,173		)	71			(12,097		)
Settlement of the Deferred purchase price obligation – Anadarko (6)	—		—			(37,346		)	—
Distributions to WGP unitholders (7)	94,205		77,462			264,533			235,587
Distributions to WES unitholders (8)	1,790		1,670			5,280			3,915
Above-market component of swap agreements with Anadarko	18,049		18,417			46,719			34,782

⁽¹⁾  Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

⁽²⁾  Represents expenses incurred on and subsequent to the date of the acquisition of WES assets, as well as expenses incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES.

⁽³⁾  Represents general and administrative expense incurred on and subsequent to the date of WES’s acquisition of WES assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of WES assets by WES. These amounts include equity-based compensation expense allocated to WES and WGP by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plan within this Note 5) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

⁽⁴⁾  Represents interest income recognized on the note receivable from Anadarko.

⁽⁵⁾  Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2andNote 9).

⁽⁶⁾  Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 2).

⁽⁷⁾  Represents distributions paid under WGP’s partnership agreement (see Note 3 and Note 4).

⁽⁸⁾  Represents distributions paid to other subsidiaries of Anadarko under WES’s partnership agreement (see Note 3 and Note 4).

Concentration of credit risk. Anadarko was the only customer from whom revenues exceeded 10% of consolidated revenues for all periods presented in the consolidated statements of operations.

25

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

6.  PROPERTY, PLANT AND EQUIPMENT

A summary of the historical cost of WES’s property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2017		December 31, 2016
Land	n/a	$	4,271	$	4,012
Gathering systems and processing complexes	3 to 47 years	6,972,302		6,462,053
Pipelines and equipment	15 to 45 years	139,344		139,646
Assets under construction	n/a	434,432		226,626
Other	3 to 40 years	31,829		29,605
Total property, plant and equipment		7,582,178		6,861,942
Accumulated depreciation		2,074,464		1,812,010
Net property, plant and equipment		$	5,507,714	$	5,049,932

The cost of property classified as “Assets under construction” is excluded from capitalized costs being depreciated. These amounts represent property that is not yet suitable to be placed into productive service as of the respective balance sheet date.

Impairments. During the nine months ended September 30, 2017, WES recognized impairments of $170.1 million, including an impairment of $158.8 million at the Granger complex, which was impaired to its estimated fair value of $48.5 million using the income approach and Level 3 fair value inputs, due to a reduced throughput fee as a result of a producer’s bankruptcy. Also during the period, WES recognized additional impairments of $11.3 million, primarily related to (i) a $3.7 million impairment at the Granger straddle plant, which was impaired to its estimated salvage value of $0.6 million using the income approach and Level 3 fair value inputs, (ii) a $3.1 million impairment of the Fort Union equity investment (see Note 7), (iii) a $2.0 million impairment of an idle facility in northeast Wyoming, which was impaired to its estimated salvage value of $0.4 million using the market approach and Level 3 fair value inputs, and (iv) the cancellation of a pipeline project in West Texas.

During 2016, WES recognized impairments of $15.5 million, including an impairment of $6.1 million at the Newcastle system, which was impaired to its estimated fair value of $3.1 million using the income approach and Level 3 fair value inputs, due to a reduction in estimated future cash flows caused by the low commodity price environment. Also during 2016, WES recognized impairments of $9.4 million, primarily related to the cancellation of projects at the DJ Basin complex and Springfield and DBJV systems, and the abandonment of compressors at the MIGC system.

26

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

7.  EQUITY INVESTMENTS

The following table presents the activity of WES’s equity investments for the nine months ended September 30, 2017:

	Equity Investments
thousands	Fort Union			White Cliffs			Rendezvous			Mont Belvieu JV			TEG			TEP			FRP			Total
Balance at December 31, 2016	$	12,833		$	47,319		$	46,739		$	112,805		$	15,846		$	189,194		$	169,472		$	594,208
Investment earnings (loss), net of amortization	2,964			9,984			840			20,430			2,325			13,332			12,833			62,708
Impairment expense (1)	(3,110		)	—			—			—			—			—			—			(3,110		)
Contributions	—			277			—			—			—			107			—			384
Distributions	(3,359		)	(9,548		)	(2,296		)	(20,459		)	(2,167		)	(13,520		)	(12,964		)	(64,313		)
Distributions in excess of cumulative earnings (2)	(1,662		)	(2,325		)	(1,616		)	(2,316		)	—			(6,091		)	(2,245		)	(16,255		)
Balance at September 30, 2017	$	7,666		$	45,707		$	43,667		$	110,460		$	16,004		$	183,022		$	167,096		$	573,622

⁽¹⁾  Recorded in Impairments in the consolidated statements of operations.

⁽²⁾  Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

The investment balance in Fort Union at September 30, 2017, is $3.1 million less than WES’s underlying equity in Fort Union’s net assets due to an impairment loss recognized by WES in the second quarter of 2017 for its investment in Fort Union. This investment was impaired to its estimated fair value of $8.5 million, using the income approach and Level 3 fair value inputs.

27

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

8.  COMPONENTS OF WORKING CAPITAL

A summary of accounts receivable, net is as follows:

thousands	September 30, 2017		December 31, 2016
Trade receivables, net	$	192,394	$	192,606
Other receivables, net	43		30,415
Total accounts receivable, net	$	192,437	$	223,021

A summary of other current assets is as follows:

thousands	September 30, 2017		December 31, 2016
Natural gas liquids inventory	$	8,459	$	7,126
Imbalance receivables	2,103		3,483
Prepaid insurance	2,935		2,889
Total other current assets	$	13,497	$	13,498

A summary of accrued liabilities is as follows:

thousands	September 30, 2017		December 31, 2016
Accrued interest expense	$	45,624	$	39,834
Short-term asset retirement obligations	3,976		3,114
Short-term remediation and reclamation obligations	630		630
Income taxes payable	1,024		1,006
Other	6,445		606
Total accrued liabilities	$	57,699	$	45,190

28

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

9.  DEBT AND INTEREST EXPENSE

At September 30, 2017, WGP’s debt consisted of borrowings under the WGP RCF and WES’s 5.375% Senior Notes due 2021 (the “2021 Notes”), 4.000% Senior Notes due 2022 (the “2022 Notes”), 2.600% Senior Notes due 2018 (the “2018 Notes”), 5.450% Senior Notes due 2044 (the “2044 Notes”), 3.950% Senior Notes due 2025 (the “2025 Notes”), 4.650% Senior Notes due 2026 (the “2026 Notes”) and borrowings on the WES RCF.

The following table presents WES and WGP’s outstanding debt as of September 30, 2017, and December 31, 2016:

	September 30, 2017						December 31, 2016
thousands	Principal		Carrying Value		Fair Value(1)		Principal		Carrying Value		Fair Value (1)
WGP RCF	$	28,000	$	28,000	$	28,000	$	28,000	$	28,000	$	28,000
2021 Notes	500,000		495,541		536,712		500,000		494,734		536,252
2022 Notes	670,000		668,795		693,789		670,000		668,634		681,723
2018 Notes	350,000		349,558		351,770		350,000		349,188		351,531
2044 Notes	600,000		593,206		634,283		600,000		593,132		615,753
2025 Notes	500,000		491,653		503,322		500,000		490,971		492,499
2026 Notes	500,000		495,133		525,069		500,000		494,802		518,441
WES RCF	250,000		250,000		250,000		—		—		—
Total long-term debt	$	3,398,000	$	3,371,886	$	3,522,945	$	3,148,000	$	3,119,461	$	3,224,199

⁽¹⁾  Fair value is measured using the market approach and Level 2 inputs.

Debt activity. The following table presents WES and WGP’s debt activity for the nine months ended September 30, 2017:

thousands	Carrying Value
Balance at December 31, 2016	$	3,119,461
WES RCF borrowings	250,000
Other	2,425
Balance at September 30, 2017	$	3,371,886

WGP RCF. As of September 30, 2017, WGP had $28.0 million of outstanding borrowings and $222.0 million available for borrowing under the WGP RCF, which matures in March 2019. As of September 30, 2017 and 2016, the interest rate on the outstanding WGP RCF borrowings was 3.24% and 2.53%, respectively. The commitment fee rate was 0.30% at September 30, 2017 and 2016. At September 30, 2017, WGP was in compliance with all covenants under the WGP RCF.

WGP WCF. As of September 30, 2017, WGP had no outstanding borrowings and $30.0 million available for borrowing under the WGP WCF. The interest rate on the WGP WCF was 2.74% and 2.03% at September 30, 2017 and 2016, respectively. At September 30, 2017, WGP was in compliance with all covenants under the WGP WCF. The WGP WCF will mature on November 1, 2017, and WGP does not intend to renew this facility.

WES Senior Notes. The 2018 Notes, which are due in August 2018, were classified as long-term debt on the consolidated balance sheet at September 30, 2017, as WES has the ability and intent to refinance these obligations using long-term debt. At September 30, 2017, WES was in compliance with all covenants under the indentures governing its outstanding notes.

29

WESTERN GAS EQUITY PARTNERS, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

9.  DEBT AND INTEREST EXPENSE (CONTINUED)

WES RCF. As of September 30, 2017, WES had $250.0 million of outstanding WES RCF borrowings and $4.6 million in outstanding letters of credit, resulting in $945.4 million available for borrowing under the WES RCF, which matures in February 2020. As of September 30, 2017 and 2016, the interest rate on the outstanding WES RCF borrowings was 2.54% and 1.82%, respectively. The facility fee rate was 0.20% at September 30, 2017 and 2016. At September 30, 2017, WES was in compliance with all covenants under the WES RCF.

Interest expense. The following table summarizes the amounts included in interest expense:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Third parties
Long-term debt	$	(36,223	)	$	(31,795	)	$	(106,412	)	$	(88,123	)
Amortization of debt issuance costs and commitment fees	(2,009		)	(2,022		)	(5,955		)	(5,517		)
Capitalized interest	2,115			1,343			3,991			4,674
Total interest expense – third parties	(36,117		)	(32,474		)	(108,376		)	(88,966		)
Affiliates
Deferred purchase price obligation – Anadarko (1)	—			1,173			(71		)	12,097
Total interest expense – affiliates	—			1,173			(71		)	12,097
Interest expense	$	(36,117	)	$	(31,301	)	$	(108,447	)	$	(76,869	)

⁽¹⁾  See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.

10.  COMMITMENTS AND CONTINGENCIES

Litigation and legal proceedings. From time to time, WGP, through its partnership interests in WES, is involved in legal, tax, regulatory and other proceedings in various forums regarding performance, contracts and other matters that arise in the ordinary course of business. Management is not aware of any such proceeding the final disposition of which could have a material adverse effect on the financial condition, results of operations or cash flows of WGP.

Other commitments. WES has short-term payment obligations, or commitments, related to its capital spending programs, as well as those of its unconsolidated affiliates. As of September 30, 2017, WES had unconditional payment obligations for services to be rendered or products to be delivered in connection with its capital projects of $143.3 million, the majority of which is expected to be paid in the next twelve months. These commitments relate primarily to expansion projects at the DBJV system and the DJ Basin and DBM complexes.

Lease commitments. Anadarko, on WES’s behalf, has entered into lease arrangements for corporate offices, shared field offices and a warehouse supporting WES’s operations, and equipment leases for which Anadarko charges WES rent. The leases for the corporate offices and shared field offices extend through 2028 and 2033, respectively, and the lease for the warehouse expired in February 2017.

WES’s rent expense associated with office, warehouse and equipment leases was $11.3 million and $30.7 million for the three and nine months ended September 30, 2017, respectively, and $8.9 million and $26.2 million for the three and nine months ended September 30, 2016, respectively.

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Item 2.  Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion analyzes our financial condition and results of operations and should be read in conjunction with the Consolidated Financial Statements and Notes to Consolidated Financial Statements, in which WES is fully consolidated, which are included under Part I, Item 1 of this quarterly report, as well as our historical consolidated financial statements, and the notes thereto, which are included under Part II, Item 8 of our 2016 Form 10-K as filed with the SEC on February 23, 2017.

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

We have made in this Form 10-Q, and may from time to time make in other public filings, press releases and statements by management, forward-looking statements concerning WES’s operations, economic performance and financial condition. These forward-looking statements include statements preceded by, followed by or that otherwise include the words “believes,” “expects,” “anticipates,” “intends,” “estimates,” “projects,” “target,” “goal,” “plans,” “objective,” “should” or similar expressions or variations on such expressions. These statements discuss future expectations, contain projections of results of operations or financial condition or include other “forward-looking” information.

Although we and WGP GP believe that the expectations reflected in such forward-looking statements are reasonable, neither we nor WGP GP can give any assurance that such expectations will prove to have been correct. These forward-looking statements involve risks and uncertainties. Important factors that could cause actual results to differ materially from expectations include, but are not limited to, the following:

• our ability to pay distributions to our unitholders;

• our expected receipt of, and the amounts of, distributions from WES;

• WES’s and Anadarko’s assumptions about the energy market;

• WES’s future throughput (including Anadarko production) which is gathered or processed by or transported through WES’s assets;

• operating results of WES;

• competitive conditions;

• technology;

• the availability of capital resources to fund acquisitions, capital expenditures and other contractual obligations of WES, and WES’s ability to access those resources from Anadarko or through the debt or equity capital markets;

• the supply of, demand for, and price of, oil, natural gas, NGLs and related products or services;

• WES’s ability to mitigate exposure to the commodity price risks inherent in its percent-of-proceeds and keep-whole contracts through the extension of WES’s commodity price swap agreements with Anadarko, or otherwise;

• weather and natural disasters;

• inflation;

• the availability of goods and services;

• general economic conditions, internationally, domestically or in the jurisdictions in which WES is doing business;

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• federal, state and local laws, including those that limit Anadarko and other producers’ hydraulic fracturing or other oil and natural gas operations;

• environmental liabilities;

• legislative or regulatory changes, including changes affecting our or WES’s status as a partnership for federal income tax purposes;

• changes in the financial or operational condition of WES or Anadarko;

• the creditworthiness of Anadarko or WES’s other counterparties, including financial institutions, operating partners, and other parties;

• changes in WES’s or Anadarko’s capital program, strategy or desired areas of focus;

• WES’s commitments to capital projects;

• WES’s ability to use the WES RCF;

• our and WES’s ability to repay debt;

• conflicts of interest among WES, WES GP, WGP and WGP GP, and affiliates, including Anadarko;

• WES’s ability to maintain and/or obtain rights to operate its assets on land owned by third parties;

• our or WES’s ability to acquire assets on acceptable terms from Anadarko or third parties, and Anadarko’s ability to generate an inventory of assets suitable for acquisition;

• non-payment or non-performance of Anadarko or WES’s other significant customers, including under WES’s gathering, processing and transportation agreements and its $260.0 million note receivable from Anadarko;

• the timing, amount and terms of our or WES’s future issuances of equity and debt securities;

• the outcome of pending and future regulatory, legislative, or other proceedings or investigations, including the investigation by the National Transportation Safety Board (“NTSB”), related to Anadarko’s operations in Colorado, and continued or additional disruptions in operations that may occur as Anadarko and WES comply with regulatory orders or other state or local changes in laws or regulations in Colorado; and

• other factors discussed below, in “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Estimates” included in our 2016 Form 10-K, and in our quarterly reports on Form 10-Q, and in our other public filings and press releases.

The risk factors and other factors noted throughout or incorporated by reference in this Form 10-Q could cause actual results to differ materially from those contained in any forward-looking statement. Except as required by law, we undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

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EXECUTIVE SUMMARY

We were formed by Anadarko in September 2012 by converting WGR Holdings, LLC into an MLP and changing its name to Western Gas Equity Partners, LP. We closed our IPO in December 2012 and own WES GP and a significant limited partner interest in WES, a growth-oriented Delaware MLP formed by Anadarko to acquire, own, develop and operate midstream energy assets. Our consolidated financial statements include the consolidated financial results of WES due to our 100% ownership interest in WES GP and WES GP’s control of WES. Our only cash-generating assets consist of our partnership interests in WES, and we currently have no independent operations.

WES currently owns or has investments in assets located in the Rocky Mountains (Colorado, Utah and Wyoming), North-central Pennsylvania and Texas. WES is engaged in the business of gathering, compressing, treating, processing and transporting natural gas; gathering, stabilizing and transporting condensate, NGLs and crude oil; and gathering and disposing of produced water. WES provides these midstream services for Anadarko, as well as for third-party producers and customers. As of September 30, 2017, WES’s assets and investments consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Gathering systems	12	3	3	2
Treating facilities	19	3	—	3
Natural gas processing plants/trains	19	5	—	2
NGL pipelines	2	—	—	3
Natural gas pipelines	5	—	—	—
Oil pipelines	—	1	—	1

Significant financial and operational events during the nine months ended September 30, 2017, included the following:

• We raised our distribution to $0.53750 per unit for the third quarter of 2017, representing a 2%increase over the distribution for the second quarter of 2017 and a 20%increase over the distribution for the third quarter of 2016.

• In March 2017, WES acquired the Additional DBJV System Interest from a third party in exchange for the Non-Operated Marcellus Interest and $155.0 million of cash consideration, resulting in a net gain of $125.7 million. See Acquisitions and Divestitures within this Item 2 for additional information.

• In May 2017, WES reached an agreement with Anadarko to settle the outstanding Deferred purchase price obligation - Anadarko, whereby WES made a cash payment to Anadarko of $37.3 million during the second quarter of 2017.

• On March 1, 2017, 50% of the outstanding WES Series A Preferred units converted into WES common units on a one-for-one basis, and on May 2, 2017, the remaining WES Series A Preferred units converted into WES common units on a one-for-one basis. See Equity Offerings within this Item 2 for additional information.

• During the second quarter of 2017, WES commenced operation of the DBM water systems (included within Gathering systems in the table above).

• In June 2017, WES closed on the sale of its Helper and Clawson systems, which resulted in a net gain on divestiture of $16.4 million. See Acquisitions and Divestitures within this Item 2 for additional information.

• In February 2017, Anadarko elected to extend the conversion date of the WES Class C units from December 31, 2017, to March 1, 2020.

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• WES received $52.9 million in cash proceeds from insurers in final settlement of its claims related to the incident at the DBM complex, including $29.9 million for business interruption insurance claims and $23.0 million for property insurance claims. See Liquidity and Capital Resources within this Item 2 for additional information.

• WES raised its distribution to $0.905 per unit for the third quarter of 2017, representing a 2%increase over the distribution for the second quarter of 2017 and a 7%increase over the distribution for the third quarter of 2016.

• Throughput attributable to WES for natural gas assets totaled 3,427 MMcf/d and 3,610 MMcf/d for the three and nine months ended September 30, 2017, respectively, representing a 16% and 8%decrease, respectively, compared to the same periods in 2016.

• Throughput for crude, NGL and produced water assets totaled 209 MBbls/d and 187 MBbls/d for the three and nine months ended September 30, 2017, respectively, representing a 13% and 1%increase, respectively, compared to the same periods in 2016.

• WES’s operating income (loss) was $179.5 million and $525.5 million for the three and nine months ended September 30, 2017, respectively, representing a 9% decrease and 0% change, respectively, compared to the same periods in 2016.

• Adjusted gross margin attributable to WES for natural gas assets (as defined under the caption Key Performance Metrics within this Item 2) averaged $0.97 per Mcf and $0.92 per Mcf for the three and nine months ended September 30, 2017, respectively, representing an 18% and 12%increase, respectively, compared to the same periods in 2016.

• Adjusted gross margin for crude, NGL and produced water assets (as defined under the caption Key Performance Metrics within this Item 2) averaged $2.03 per Bbl and $2.05 per Bbl for the three and nine months ended September 30, 2017, respectively, representing an 8% and 2%decrease, respectively, compared to the same periods in 2016.

Anadarko’s Colorado Response. Following a home explosion in Firestone, Colorado in April 2017, Anadarko took precautionary measures to shut in all operated vertical wells in the DJ Basin to conduct additional inspections. It subsequently tested and permanently plugged, abandoned, and capped all one-inch return lines associated with these wells. In May 2017, the Colorado Oil & Gas Conservation Commission (“COGCC”) issued a two-phase Notice to Operators (“NTO”) requiring all operators to inventory and integrity test existing flowlines within 1,000 feet of a building unit and abandon all inactive flowlines in such areas. During the third quarter, Anadarko substantially completed the requirements of the NTO. In August 2017, following a three-month review of oil and gas operations, the Governor of Colorado announced several policy initiatives designed to enhance public safety, which are to be implemented over the next several months through rulemaking or legislation. Anadarko continues to work cooperatively with state regulators and others and is also cooperating with the NTSB in its investigation related to the incident.

Significant Item Affecting Comparability. On December 3, 2015, there was an initial fire and secondary explosion at the processing facility within the DBM complex. The majority of the damage was to the liquid handling facilities and the amine treating units at the inlet of the complex. Train II (with capacity of 100 MMcf/d) sustained the most damage of the processing trains and returned to service in December 2016. Train III (with capacity of 200 MMcf/d) experienced minimal damage and returned to full service in May 2016. For ease of reference throughout the remainder of this Management’s Discussion and Analysis, the damage to the processing facility and resulting lack of processing capacity and associated financial statement impact is referred to as the “DBM outage.” See Note 1—Description of Business and Basis of Presentation in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

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ACQUISITIONS AND DIVESTITURES

Acquisitions. The following table presents the acquisitions completed by WES during 2017 and 2016, and identifies the funding sources for such acquisitions. See Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		WES Common Units Issued	WES Series A Preferred Units Issued
Springfield system (1)	03/14/2016	50.1	%	$	247,500	$	—	2,089,602	14,030,611
DBJV system (2)	03/17/2017	50	%	—		155,000		—	—

⁽¹⁾  WES acquired Springfield from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in the Springfield system. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units to private investors. See Note 4—Equity and Partners’ Capitalin the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for further information regarding WES’s Series A Preferred units. WGP financed the purchase of the WES common units by borrowing $25.0 million under the WGP RCF. See Note 9—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽²⁾  WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

Property exchange. On March 17, 2017, WES acquired the Additional DBJV System Interest from a third party in exchange for the Non-Operated Marcellus Interest and $155.0 million of cash consideration. WES previously held a 50% interest in, and operated, the DBJV system. The Property Exchange resulted in a net gain of $125.7 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations. See Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Divestitures. During the second quarter of 2017, the Helper and Clawson systems, located in Utah, were sold to a third party, resulting in a net gain on sale of $16.4 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations.

During the fourth quarter of 2016, the Hugoton system, located in Southwest Kansas and Oklahoma, was sold to a third party, resulting in a net loss on sale of $12.0 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations.

Presentation of WES assets.The term “WES assets” includes both the assets indirectly owned and the interests accounted for under the equity method (See Note 7—Equity Investments in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q) by us through our partnership interests in WES as of September 30, 2017. Because Anadarko controls WES through its ownership and control of us, and because we own the entire interest in WES GP, each of WES’s acquisitions of WES assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, WES assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by WES (see Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q). Further, after an acquisition of WES assets from Anadarko, we (by virtue of our consolidation of WES) and WES may be required to recast our financial statements to include the activities of such WES assets from the date of common control.

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EQUITY OFFERINGS

Public equity offerings. In June 2016, Anadarko sold 12,500,000 of its WGP common units to the public through an underwritten offering. We did not receive any proceeds from, or incur any expense in, the public offering.

Tangible equity units. In June 2015, Anadarko completed the public issuance of 9,200,0007.50% TEUs, including 1,200,000 TEUs pursuant to the full exercise of the underwriters’ over-allotment option, at a price to the public of $50.00 per TEU. Each TEU that Anadarko issued consists of (1) a prepaid equity purchase contract for WGP common units owned by Anadarko (subject to Anadarko’s right to elect to deliver shares of its common stock in lieu of such WGP common units) and (2) a senior amortizing note due June 7, 2018. We did not receive any proceeds from, or incur any expense in, the public offering.

WES Series A Preferred units. In 2016, WES issued 21,922,831 WES Series A Preferred units to private investors. Pursuant to an agreement between WES and the holders of the WES Series A Preferred units, 50% of the WES Series A Preferred units converted into WES common units on a one-for-one basis on March 1, 2017, and the remaining WES Series A Preferred units converted on a one-for-one basis on May 2, 2017. See Note 4—Equity and Partners’ Capital in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

ITEMS AFFECTING THE COMPARABILITY OF FINANCIAL RESULTS

Our consolidated financial statements include the consolidated financial results of WES due to our 100% ownership interest in WES GP and WES GP’s control of WES. Our only cash-generating assets consist of our partnership interests in WES, and we currently have no independent operations. As a result, our results of operations do not differ materially from the results of operations and cash flows of WES, which are reconciled below.

General and administrative expenses. As a separate publicly traded partnership, we incur general and administrative expenses which are separate from, and in addition to, those incurred by WES.

The following table summarizes the amounts we reimbursed to Anadarko, separate from, and in addition to, those reimbursed by WES:

	Three Months Ended   September 30,				Nine Months Ended   September 30,
thousands	2017		2016		2017		2016
General and administrative expenses	$	131	$	64	$	197	$	192
Public company expenses	386		408		1,452		2,062
Total reimbursement	$	517	$	472	$	1,649	$	2,254

Noncontrolling interests. The interest in Chipeta held by a third-party member is already reflected as a noncontrolling interest in WES’s consolidated financial statements. In addition, the limited partner interests in WES held by other subsidiaries of Anadarko, private investors (up to the final conversion date of the Series A Preferred units on May 2, 2017) and the public are reflected as noncontrolling interests in the consolidated financial statements (see Note 1—Description of Business and Basis of Presentation in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for further information).

When WES issues equity, the carrying amount of the noncontrolling interest reported by WGP is adjusted to reflect the noncontrolling ownership interest in WES. The resulting impact of such noncontrolling interest adjustment on WGP’s interest in WES is reflected as an adjustment to WGP’s partners’ capital.

Distributions. Our partnership agreement requires that we distribute all of our available cash (as defined in our partnership agreement) within 55 days after the end of each quarter. Our only cash-generating assets are our partnership interests in WES, consisting of general partner units, common units and incentive distribution rights, on which we expect to receive quarterly distributions from WES. Our cash flow and resulting ability to make cash distributions are therefore completely dependent upon WES’s ability to make cash distributions with respect to our partnership interests in WES. Generally, our available cash is our cash on hand at the end of a quarter after the payment of our expenses and the establishment of cash reserves and cash on hand resulting from working capital borrowings made after the end of the quarter.

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Western Gas Equity Partners, LP 2012 Long-Term Incentive Plan. Concurrently with the WGP IPO, WGP GP adopted the WGP LTIP. Equity-based compensation expense attributable to grants made under the WGP LTIP impacts cash flows from operating activities only to the extent cash payments are made to a participant in lieu of issuance of WGP common units to the participant. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for further information.

WGP RCF. In March 2016, we entered into a $250.0 million WGP RCF which matures in March 2019. The WGP RCF may be used to buy WES common units and for general partnership purposes.

As of September 30, 2017, we had $28.0 million of outstanding borrowings and $222.0 million available for borrowing under the WGP RCF. At September 30, 2017, the interest rate on WGP RCF was 3.24%, the commitment fee rate was 0.30% and we were in compliance with all covenants under the WGP RCF. See Note 9—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for further information.

WGP WCF. On November 1, 2012, we entered into the WGP WCF, a $30.0 million working capital facility with Anadarko as the lender. The facility is available exclusively to fund our working capital borrowings. As of September 30, 2017, we had no outstanding borrowings and $30.0 million available for borrowing under the WGP WCF. WGP WCF bears interest at LIBOR plus 1.50%, and the interest rate was 2.74% at September 30, 2017. At September 30, 2017, we were in compliance with all covenants under the WGP WCF. The WGP WCF will mature on November 1, 2017, and we do not intend to renew this facility.

Reconciliation of net income (loss) attributable to Western Gas Partners, LP to net income (loss) attributable to Western Gas Equity Partners, LP. The differences between net income (loss) attributable to WES and net income (loss) attributable to WGP are reconciled as follows:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Net income (loss) attributable to WES	$	143,506		$	167,746		$	418,846		$	448,327
Limited partner interests in WES not held by WGP (1)	(45,992		)	(75,098		)	(137,974		)	(182,128		)
General and administrative expenses (2)	(764		)	(730		)	(2,193		)	(2,972		)
Other income (expense), net	25			12			60			46
Property and other taxes	—			—			—			(15		)
Interest expense	(573		)	(533		)	(1,653		)	(1,182		)
Net income (loss) attributable to WGP	$	96,202		$	91,397		$	277,086		$	262,076

⁽¹⁾  Represents the portion of net income (loss) allocated to the limited partner interests in WES not held by WGP. As of September 30, 2017 and 2016, the public held a 59.7% and 60.0% limited partner interest in WES, respectively. Other subsidiaries of Anadarko separately held a 9.0% and 8.5% limited partner interest in WES as of September 30, 2017 and 2016, respectively. See Note 1—Description of Business and Basis of Presentation in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽²⁾  Represents general and administrative expenses incurred by WGP separate from, and in addition to, those incurred by WES.

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Reconciliation of net cash provided by (used in) operating and financing activities. The differences between net cash provided by (used in) operating and financing activities for WGP and WES are reconciled as follows:

	Nine Months Ended   September 30,
thousands	2017			2016
WES net cash provided by operating activities	$	645,099		$	657,738
General and administrative expenses (1)	(2,193		)	(2,972		)
Non-cash equity-based compensation expense	178			189
Changes in working capital	471			540
Other income (expense), net	60			46
Property and other taxes	—			(15		)
Interest expense	(1,653		)	(1,182		)
Debt related amortization and other items, net	507			356
WGP net cash provided by operating activities	$	642,469		$	654,700
WES net cash provided by (used in) financing activities	$	(335,792	)	$	429,368
Proceeds from the issuance of WES common units, net of offering expenses (2)	—			(25,000		)
Distributions to WGP unitholders (3)	(324,290		)	(276,114		)
Distributions to WGP from WES (4)	326,374			278,412
WGP RCF borrowings, net of issuance costs	—			25,980
WGP net cash provided by (used in) financing activities	$	(333,708	)	$	432,646

⁽¹⁾  Represents general and administrative expenses incurred by WGP separate from, and in addition to, those incurred by WES.

⁽²⁾  Represents the difference attributable to elimination upon consolidation of proceeds to WES from the issuance of WES common units to WGP as part of funding the Springfield acquisition. See Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽³⁾  Represents distributions to WGP common unitholders paid under WGP’s partnership agreement. See Note 3—Partnership Distributions and Note 4—Equity and Partners’ Capital in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽⁴⁾  Difference attributable to elimination upon consolidation of WES’s distributions on partnership interests owned by WGP. See Note 3—Partnership Distributions and Note 4—Equity and Partners’ Capital in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

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RESULTS OF OPERATIONS

OPERATING RESULTS

The following tables and discussion present a summary of WES’s results of operations:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Total revenues and other(1)	$	574,695		$	481,645		$	1,616,338		$	1,293,450
Equity income, net – affiliates	21,519			20,294			62,708			56,801
Total operating expenses(1)	416,830			312,088			1,318,489			830,699
Gain (loss) on divestiture and other, net	72			(6,230		)	135,017			(8,769		)
Proceeds from business interruption insurance claims (2)	—			13,667			29,882			16,270
Operating income (loss)	179,456			197,288			525,456			527,053
Interest income – affiliates	4,225			4,225			12,675			12,675
Interest expense	(35,544		)	(30,768		)	(106,794		)	(75,687		)
Other income (expense), net	286			153			969			224
Income (loss) before income taxes	148,423			170,898			432,306			464,265
Income tax (benefit) expense	510			472			4,905			7,431
Net income (loss)	147,913			170,426			427,401			456,834
Net income attributable to noncontrolling interest	4,407			2,680			8,555			8,507
Net income (loss) attributable to Western Gas Partners, LP (3)	$	143,506		$	167,746		$	418,846		$	448,327
Key performance metrics(4)
Adjusted gross margin attributable to Western Gas Partners, LP	$	344,416		$	343,981		$	1,009,520		$	984,459
Adjusted EBITDA attributable to Western Gas Partners, LP	257,835			278,170			787,664			759,834
Distributable cash flow	231,859			237,315			695,587			628,602

⁽¹⁾  Revenues and other include amounts earned by WES from services provided to its affiliates, as well as from the sale of residue and NGLs to its affiliates. Operating expenses include amounts charged by WES affiliates for services as well as reimbursement of amounts paid by affiliates to third parties on WES’s behalf. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽²⁾  See Note 1—Description of Business and Basis of Presentationin the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽³⁾  For reconciliations to comparable consolidated results of WGP, see Items Affecting the Comparability of Financial Results within this Item 2.

⁽⁴⁾  Adjusted gross margin attributable to Western Gas Partners, LP, Adjusted EBITDA attributable to Western Gas Partners, LP and Distributable cash flow are defined under the caption Key Performance Metrics within this Item 2. For reconciliations of these non-GAAP financial measures to their most directly comparable financial measures calculated and presented in accordance with GAAP, see Key Performance Metrics–Reconciliation of non-GAAP measures within this Item 2.

For purposes of the following discussion, any increases or decreases “for the three months ended September 30, 2017” refer to the comparison of the three months ended September 30, 2017, to the three months ended September 30, 2016; any increases or decreases “for the nine months ended September 30, 2017” refer to the comparison of the nine months ended September 30, 2017, to the nine months ended September 30, 2016; and any increases or decreases “for the three and nine months ended September 30, 2017” refer to the comparison of these 2017 periods to the corresponding three and nine month periods ended September 30, 2016.

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Throughput

	Three Months Ended   September 30,				Nine Months Ended   September 30,
	2017	2016	Inc/ (Dec)		2017	2016	Inc/ (Dec)
Throughput for natural gas assets (MMcf/d)
Gathering, treating and transportation	784	1,562	(50	)%	1,029	1,556	(34	)%
Processing	2,588	2,448	6	%	2,528	2,301	10	%
Equity investment (1)	159	179	(11	)%	160	178	(10	)%
Total throughput for natural gas assets	3,531	4,189	(16	)%	3,717	4,035	(8	)%
Throughput attributable to noncontrolling interest for natural gas assets	104	119	(13	)%	107	127	(16	)%
Total throughput attributable to Western Gas Partners, LP for natural gas assets	3,427	4,070	(16	)%	3,610	3,908	(8	)%
Throughput for crude, NGL and produced water assets (MBbls/d)
Gathering, treating and transportation	77	58	33	%	57	59	(3	)%
Equity investment (2)	132	127	4	%	130	126	3	%
Total throughput for crude, NGL and produced water assets	209	185	13	%	187	185	1	%

⁽¹⁾  Represents WES’s 14.81% share of average Fort Union throughput and 22% share of average Rendezvous throughput.

⁽²⁾  Represents WES’s 10% share of average White Cliffs throughput, 25% share of average Mont Belvieu JV throughput, 20% share of average TEG and TEP throughput, and 33.33% share of average FRP throughput.

Natural gas assets

Gathering, treating and transportation throughput decreased by 778 MMcf/d and 527 MMcf/d for the three and nine months ended September 30, 2017, respectively, primarily due to the Property Exchange in March 2017 (decreases of 594 MMcf/d and 341 MMcf/d, respectively), production declines in the areas around the Marcellus Interest (decreases of 38 MMcf/d and 52 MMcf/d, respectively) and Springfield gas gathering systems (decreases of 40 MMcf/d and 47 MMcf/d, respectively), and the sale of the Hugoton system in October 2016 (decreases of 52 MMcf/d and 54 MMcf/d, respectively).

Processing throughput increased by 140 MMcf/d and 227 MMcf/d for the three and nine months ended September 30, 2017, respectively, primarily due to the DBM outage in 2016 and the start-up of Train IV and Train V at the DBM complex in May 2016 and October 2016, respectively. These increases were partially offset by production declines in the areas around the Chipeta complex and MGR assets.

Equity investment throughput decreased by 20 MMcf/d and 18 MMcf/d for the three and nine months ended September 30, 2017, respectively, due to decreased throughput at the Rendezvous and Fort Union systems due to production declines in the area.

Crude, NGL and produced water assets

Gathering, treating and transportation throughput increased by 19 MBbls/d for the three months ended September 30, 2017, primarily due to the start-up of operations at the DBM water systems during the second quarter of 2017, partially offset by decreased throughput at the Springfield oil gathering system due to production declines in the area.

Gathering, treating and transportation throughput decreased by 2 MBbls/d for the nine months ended September 30, 2017, primarily due to decreased throughput at the Springfield oil gathering system due to production declines in the area, partially offset by throughput from the DBM water systems that commenced operation during the second quarter of 2017.

Equity investment throughput increased by 5 MBbls/d and 4 MBbls/d for the three and nine months ended September 30, 2017, respectively, primarily due to increased volumes on FRP and TEG as a result of increased NGL production and an increase at the Mont Belvieu JV due to higher inlet throughput. These increases were partially offset by decreased throughput at White Cliffs as a result of a competitive pipeline commencing service in September 2016.

40

Gathering, Processing and Transportation Revenues

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2017		2016		Inc/ (Dec)		2017		2016		Inc/ (Dec)
Gathering, processing and transportation revenues	$	306,187	$	315,192	(3	)%	$	913,436	$	910,332	—	%

Revenues from gathering, processing and transportation decreased by $9.0 million for the three months ended September 30, 2017, primarily due to decreases of (i) $15.4 million due to the Property Exchange in March 2017, (ii) $7.4 million at the Springfield system, $2.6 million at the Chipeta complex and $1.6 million at the Marcellus Interest systems in each case due to throughput decreases, (iii) $4.7 million due to the sale of the Hugoton system in October 2016 and (iv) $2.8 million at the Granger complex due to a lower processing fee. These decreases were partially offset by increases of (i) $16.2 million at the DBM complex due to increased throughput (see Operating Results–Throughput within this Item 2), (ii) $8.5 million at the DJ Basin complex due to increased throughput and a higher throughput fee and (iii) $3.0 million at the DBM water systems that commenced operation during the second quarter of 2017.

Revenues from gathering, processing and transportation increased by $3.1 million for the nine months ended September 30, 2017, primarily due to increases of (i) $72.6 million at the DBM complex due to increased throughput (see Operating Results–Throughput within this Item 2), (ii) $23.1 million at the DJ Basin complex due to increased throughput and a higher throughput fee and (iii) $4.1 million at the DBM water systems that commenced operation during the second quarter of 2017. These increases were partially offset by decreases of (i) $25.7 million at the Springfield system, $10.8 million at the Chipeta complex and $7.6 million at the Marcellus Interest systems in each case due to throughput decreases, (ii) $28.5 million due to the Property Exchange in March 2017, (iii) $14.4 million due to the sale of the Hugoton system in October 2016 and (iv) $7.0 million at the Granger complex due to a lower processing fee.

Natural Gas and Natural Gas Liquids Sales

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages and per-unit amounts	2017		2016		Inc/ (Dec)		2017		2016		Inc/ (Dec)
Natural gas sales (1)	$	100,395	$	72,658	38	%	$	273,256	$	155,251	76	%
Natural gas liquids sales (1)	158,746		91,378		74	%	417,234		224,334		86	%
Total	$	259,141	$	164,036	58	%	$	690,490	$	379,585	82	%
Average price per unit (1):
Natural gas (per Mcf)	$	2.89	$	2.70	7	%	$	2.96	$	2.41	23	%
Natural gas liquids (per Bbl)	22.99		19.10		20	%	21.63		19.45		11	%

⁽¹⁾  Excludes amounts considered above market with respect to WES’s swap agreements for the MGR assets, DJ Basin complex and Hugoton system (until its divestiture in October 2016) that were recorded as capital contributions in the consolidated statement of equity and partners’ capital. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

For the three and nine months ended September 30, 2017, average natural gas and NGL prices included the effects of commodity price swap agreements attributable to sales for the MGR assets and DJ Basin complex. For the three and nine months ended September 30, 2016, average natural gas and NGL prices included the effects of commodity price swap agreements attributable to sales for the Hugoton system, MGR assets and DJ Basin complex. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

The increase in natural gas sales of $27.7 million for the three months ended September 30, 2017, was primarily due to increases of (i) $15.6 million at the DJ Basin complex due to an increase in the swap market price and volumes sold and (ii) $14.8 million at the DBM complex due to an increase in volumes sold (see Operating Results–Throughput within this Item 2). These increases were partially offset by a decrease of $3.0 million at the MGR assets due to the partial equity treatment of the above-market swap agreement beginning January 1, 2017.

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The increase in natural gas sales of $118.0 million for the nine months ended September 30, 2017, was primarily due to increases of (i) $75.2 million at the DBM complex due to an increase in average price and volumes sold (see Operating Results–Throughput within this Item 2), (ii) $44.3 million at the DJ Basin complex due to an increase in the swap market price and volumes sold and (iii) $4.8 million at the Hilight system due to an increase in average price. These increases were partially offset by a decrease of $9.2 million at the MGR assets due to the partial equity treatment of the above-market swap agreement beginning January 1, 2017.

The increase in NGLs sales of $67.4 million and $192.9 million for the three and nine months ended September 30, 2017, respectively, was primarily due to increases of (i) $62.7 million and $184.5 million, respectively, at the DBM complex due to an increase in average price and volumes sold (see Operating Results–Throughput within this Item 2), (ii) $15.9 million and $38.1 million, respectively, at the DJ Basin complex due to an increase in the swap market price and volumes sold and (iii) $3.3 million and $11.3 million, respectively, at the Hilight system due to an increase in average price. These increases were partially offset by decreases during the three and nine months ended September 30, 2017, of $17.7 million and $49.9 million, respectively, at the MGR assets due to the partial equity treatment of the above-market swap agreement beginning January 1, 2017.

Other Revenues

	Three Months Ended   September 30,					Nine Months Ended   September 30,
thousands except percentages	2017		2016		Inc/ (Dec)	2017		2016		Inc/ (Dec)
Other revenues	$	9,367	$	2,417	NM	$	12,412	$	3,533	NM

NM-Not Meaningful

For the three and nine months ended September 30, 2017, other revenues increased by $7.0 million and $8.9 million, respectively, primarily due to deficiency fees at the Chipeta complex.

Equity Income, Net – Affiliates

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2017		2016		Inc/ (Dec)		2017		2016		Inc/ (Dec)
Equity income, net – affiliates	$	21,519	$	20,294	6	%	$	62,708	$	56,801	10	%

For the three and nine months ended September 30, 2017, equity income, net – affiliates increased by $1.2 million and $5.9 million, respectively, primarily due to an increase in equity income from the Mont Belvieu JV due to increased volumes processed. In addition, for the nine months ended September 30, 2017, equity income, net – affiliates increased due to WES’s 14.81% share of an impairment loss determined by the managing partner of Fort Union in the first quarter of 2016.

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Cost of Product and Operation and Maintenance Expenses

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2017		2016		Inc/ (Dec)		2017		2016		Inc/ (Dec)
NGL purchases (1)	$	136,636	$	66,822	104	%	$	359,616	$	149,547	140	%
Residue purchases (1)	90,264		70,376		28	%	256,387		156,774		64	%
Other	12,323		8,445		46	%	15,856		20,638		(23	)%
Cost of product	239,223		145,643		64	%	631,859		326,959		93	%
Operation and maintenance	79,536		74,755		6	%	229,444		226,141		1	%
Total cost of product and operation and maintenance expenses	$	318,759	$	220,398	45	%	$	861,303	$	553,100	56	%

⁽¹⁾  Excludes amounts considered above market with respect to WES’s swap agreements for the MGR assets, DJ Basin complex and Hugoton system (until its divestiture in October 2016) that were recorded as capital contributions in the consolidated statement of equity and partners’ capital. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Cost of product expense for the three and nine months ended September 30, 2017, included the effects of commodity price swap agreements attributable to purchases for the MGR assets and DJ Basin complex. Cost of product expense for the three and nine months ended September 30, 2016, included the effects of commodity price swap agreements attributable to purchases for the Hugoton system, MGR assets and DJ Basin complex. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

NGL purchases increased by $69.8 million and $210.1 million for the three and nine months ended September 30, 2017, respectively, primarily due to increases of (i) $61.4 million and $177.1 million, respectively, at the DBM complex due to an increase in average price and volumes purchased (see Operating Results–Throughput within this Item 2), (ii) $13.2 million and $43.2 million, respectively, at the DJ Basin complex due to an increase in the swap market price and volumes purchased and (iii) $2.7 million and $9.2 million, respectively, at the Hilight system due to an increase in average price, partially offset by a decrease in volumes purchased. These increases were partially offset by decreases during the three and nine months ended September 30, 2017, of $9.5 million and $26.6 million, respectively, at the MGR assets due to the partial equity treatment of the above-market swap agreement beginning January 1, 2017.

Residue purchases increased by $19.9 million and $99.6 million for the three and nine months ended September 30, 2017, respectively, primarily due to increases of (i) $12.6 million and $68.7 million, respectively, at the DBM complex due to an increase in average price and volumes purchased (see Operating Results–Throughput within this Item 2) and (ii) $12.3 million and $36.5 million, respectively, at the DJ Basin complex due to an increase in the swap market price and volumes purchased. In addition, for the nine months ended September 30, 2017, there was an increase of $4.6 million at the Hilight system due to an increase in average price. These increases were partially offset by decreases during the three and nine months ended September 30, 2017, of $3.9 million and $12.0 million, respectively, at the MGR assets due to the partial equity treatment of the above-market swap agreement beginning January 1, 2017.

Other items increased by $3.9 million for the three months ended September 30, 2017, primarily due to changes in affiliate contract terms at the DJ Basin complex. Other items decreased by $4.8 million for the nine months ended September 30, 2017, primarily due to fees paid in 2016 for rerouting volumes due to the DBM outage, partially offset by changes in affiliate contract terms at the DJ Basin complex in 2017.

Operation and maintenance expense increased by $4.8 million for the three months ended September 30, 2017, primarily due to increases of (i) $2.6 million due to the Property Exchange in March 2017, (ii) $1.4 million in utilities expense primarily at the DJ Basin and DBM complexes and (iii) $1.4 million in salaries and wages primarily at the Springfield system. Operation and maintenance expense increased by $3.3 million for the nine months ended September 30, 2017, primarily due to an increase of $3.0 million due to the Property Exchange in March 2017.

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Other Operating Expenses

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages	2017		2016		Inc/ (Dec)		2017		2016		Inc/ (Dec)
General and administrative	$	12,158	$	11,382	7	%	$	35,402	$	33,542	6	%
Property and other taxes	11,215		10,670		5	%	35,433		33,098		7	%
Depreciation and amortization	72,539		67,246		8	%	216,272		199,646		8	%
Impairments	2,159		2,392		(10	)%	170,079		11,313		NM
Total other operating expenses	$	98,071	$	91,690	7	%	$	457,186	$	277,599	65	%

NM-Not Meaningful

General and administrative expenses increased by $0.8 million and $1.9 million for the three and nine months ended September 30, 2017, respectively, primarily due to increases in personnel costs for which WES reimbursed Anadarko pursuant to the WES omnibus agreement and bad debt expense, partially offset by decreases in legal and consulting fees.

Property and other taxes increased by $0.5 million for the three months ended September 30, 2017, primarily due to an ad valorem tax increase at the DJ Basin complex, partially offset by a decrease at the DBM complex. Property and other taxes increased by $2.3 million for the nine months ended September 30, 2017, primarily due to ad valorem tax increases at the DBM complex and DBJV system.

Depreciation and amortization expense increased by $5.3 million and $16.6 million for the three and nine months ended September 30, 2017, respectively, primarily due to depreciation expense increases of (i) $5.2 million and $10.3 million, respectively, due to the Property Exchange in March 2017, (ii) $2.4 million and $9.1 million, respectively, related to capital projects at the DBM complex and (iii) $2.8 million and $8.4 million, respectively, at the Bison facility due to a change in the estimated property life. These increases were partially offset by decreases during the three and nine months ended September 30, 2017, of (i) $1.4 million and $5.4 million, respectively, due to the sale of the Hugoton system in October 2016, (ii) $2.4 million and $4.9 million, respectively, at the Granger complex due to an impairment recorded in the first quarter of 2017 (see impairment expense below) and (iii) $1.6 million and $2.4 million, respectively, at the DJ Basin complex due to a change in estimated salvage values.

Impairment expense decreased by $0.2 million for the three months ended September 30, 2017, primarily due to a $2.0 million impairment of an idle facility in northeast Wyoming (see Note 6—Property, Plant and Equipment in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q), as compared to impairments in 2016 primarily related to the cancellation of projects at the DBJV and Marcellus Interest systems.

Impairment expense increased by $158.8 million for the nine months ended September 30, 2017, primarily due to the following items occurring in 2017 (i) a $158.8 million impairment at the Granger complex, (ii) a $3.7 million impairment at the Granger straddle plant, (iii) a $3.1 million impairment at the Fort Union system, (iv) a $2.0 million impairment of an idle facility in northeast Wyoming and (v) the cancellation of a pipeline project in West Texas. Impairment expense for the nine months ended September 30, 2016, was primarily due to (i) a $6.1 million impairment at the Newcastle system, (ii) the cancellation of projects at the DJ Basin complex and DBJV system and (iii) the abandonment of compressors at the MIGC system. See Note 6—Property, Plant and Equipment in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

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Interest Income – Affiliates and Interest Expense

	Three Months Ended   September 30,								Nine Months Ended   September 30,
thousands except percentages	2017			2016			Inc/ (Dec)		2017			2016			Inc/ (Dec)
Note receivable – Anadarko	$	4,225		$	4,225		—	%	$	12,675		$	12,675		—	%
Interest income – affiliates	$	4,225		$	4,225		—	%	$	12,675		$	12,675		—	%
Third parties
Long-term debt	$	(35,992	)	$	(31,612	)	14	%	$	(105,772	)	$	(87,711	)	21	%
Amortization of debt issuance costs and commitment fees	(1,667		)	(1,672		)	—	%	(4,942		)	(4,747		)	4	%
Capitalized interest	2,115			1,343			57	%	3,991			4,674			(15	)%
Affiliates
Deferred purchase price obligation – Anadarko (1)	—			1,173			(100	)%	(71		)	12,097			(101	)%
Interest expense	$	(35,544	)	$	(30,768	)	16	%	$	(106,794	)	$	(75,687	)	41	%

⁽¹⁾  See Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for a discussion of the Deferred purchase price obligation - Anadarko.

Interest expense increased by $4.8 million and $31.1 million for the three and nine months ended September 30, 2017, respectively, primarily due to (i) accretion revisions in 2016 recorded as reductions to interest expense for the Deferred purchase price obligation - Anadarko (see Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q), (ii) interest incurred on the 2026 Notes issued in July 2016 and (iii) interest incurred on the additional 2044 Notes issued in October 2016. These increases were partially offset during the nine months ended September 30, 2017, by additional interest incurred on the RCF in 2016 as a result of higher outstanding borrowings. Capitalized interest increased by $0.8 million for the three months ended September 30, 2017, primarily due to the construction of Train VI beginning in the fourth quarter of 2016 and the purchase of long-lead items associated with the Mentone plant, partially offset by a decrease primarily due to the completion of Train V in October 2016, all located at the DBM complex. Capitalized interest decreased by $0.7 million for the nine months ended September 30, 2017, primarily due to the completion of Trains IV and V in May 2016 and October 2016, respectively, partially offset by an increase due to the construction of Train VI beginning in the fourth quarter of 2016 and the purchase of long-lead items associated with the Mentone plant, all located at the DBM complex. See Note 9—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Income Tax (Benefit) Expense

	Three Months Ended   September 30,								Nine Months Ended   September 30,
thousands except percentages	2017			2016			Inc/ (Dec)		2017			2016			Inc/ (Dec)
Income (loss) before income taxes	$	148,423		$	170,898		(13	)%	$	432,306		$	464,265		(7	)%
Income tax (benefit) expense	510			472			8	%	4,905			7,431			(34	)%
Effective tax rate	—		%	—		%			1		%	2		%

WES is not a taxable entity for U.S. federal income tax purposes. However, WES’s income apportionable to Texas is subject to Texas margin tax. For the nine months ended September 30, 2016, the variance from the federal statutory rate was primarily due to federal and state taxes on pre-acquisition income attributable to the WES assets acquired from Anadarko, and WES’s share of Texas margin tax. For all other periods presented, the variance from the federal statutory rate, which is zero percent as a non-taxable entity, was primarily due to WES’s share of Texas margin tax.

Income attributable to the Springfield system prior to and including February 2016 was subject to federal and state income tax. Income earned on the Springfield system for periods subsequent to February 2016 was only subject to Texas margin tax on income apportionable to Texas.

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KEY PERFORMANCE METRICS

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except percentages and per-unit amounts	2017		2016		Inc/ (Dec)		2017		2016		Inc/ (Dec)
Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets (1)	$	305,337	$	306,393	—	%	$	904,620	$	877,583	3	%
Adjusted gross margin for crude, NGL and produced water assets (2)	39,079		37,588		4	%	104,900		106,876		(2	)%
Adjusted gross margin attributable to Western Gas Partners, LP (3)	344,416		343,981		—	%	1,009,520		984,459		3	%
Adjusted gross margin per Mcf attributable to Western Gas Partners, LP for natural gas assets (4)	0.97		0.82		18	%	0.92		0.82		12	%
Adjusted gross margin per Bbl for crude, NGL and produced water assets (5)	2.03		2.20		(8	)%	2.05		2.10		(2	)%
Adjusted EBITDA attributable to Western Gas Partners, LP (3)	257,835		278,170		(7	)%	787,664		759,834		4	%
Distributable cash flow (3)	231,859		237,315		(2	)%	695,587		628,602		11	%

⁽¹⁾  Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets is calculated as total revenues and other for natural gas assets, less reimbursements for electricity-related expenses recorded as revenue and cost of product for natural gas assets, plus distributions from WES’s equity investments in Fort Union and Rendezvous, and excluding the noncontrolling interest owner’s proportionate share of revenue and cost of product. See the reconciliation of Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets to its most comparable GAAP measure below.

⁽²⁾  Adjusted gross margin for crude, NGL and produced water assets is calculated as total revenues and other for crude, NGL and produced water assets, less reimbursements for electricity-related expenses recorded as revenue and cost of product for crude, NGL and produced water assets, plus distributions from WES’s equity investments in White Cliffs, the Mont Belvieu JV, and the TEFR Interests. See the reconciliation of Adjusted gross margin for crude, NGL and produced water assets to its most comparable GAAP measure below.

⁽³⁾  For a reconciliation of Adjusted gross margin attributable to Western Gas Partners, LP, Adjusted EBITDA attributable to Western Gas Partners, LP and Distributable cash flow to the most directly comparable financial measure calculated and presented in accordance with GAAP, see the descriptions below.

⁽⁴⁾  Average for period. Calculated as Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets, divided by total throughput (MMcf/d) attributable to Western Gas Partners, LP for natural gas assets.

⁽⁵⁾  Average for period. Calculated as Adjusted gross margin for crude, NGL and produced water assets, divided by total throughput (MBbls/d) for crude, NGL and produced water assets.

Adjusted gross margin attributable to Western Gas Partners, LP. WES defines Adjusted gross margin attributable to Western Gas Partners, LP (“Adjusted gross margin”) as total revenues and other, less cost of product and reimbursements for electricity-related expenses recorded as revenue, plus distributions from equity investments and excluding the noncontrolling interest owner’s proportionate share of revenue and cost of product. WES believes Adjusted gross margin is an important performance measure of the core profitability of its operations, as well as its operating performance as compared to that of other companies in the industry.

Adjusted gross margin increased by $0.4 million and $25.1 million for the three and nine months ended September 30, 2017, respectively, primarily due to (i) an increase in throughput at the DBM complex, (ii) an increase in processed volumes at the DJ Basin complex and (iii) the start-up of operations at the DBM water systems during the second quarter of 2017. These increases were partially offset by decreases from (i) the Property Exchange in March 2017, (ii) lower throughput at the Springfield and Marcellus Interest systems, (iii) the partial equity treatment of the above-market swap agreement at the MGR assets beginning January 1, 2017, and (iv) the sale of the Hugoton system in October 2016.

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To facilitate investor and industry analyst comparisons between WES and its peers, WES also discloses Adjusted gross margin per Mcf attributable to Western Gas Partners, LP for natural gas assets and Adjusted gross margin per Bbl for crude, NGL and produced water assets. Adjusted gross margin per Mcf attributable to Western Gas Partners, LP for natural gas assets increased by $0.15 and $0.10 for the three and nine months ended September 30, 2017, respectively, primarily due to the Property Exchange in March 2017 and increased throughput at the DBM complex. Adjusted gross margin per Bbl for crude, NGL and produced water assets decreased by $0.17 for the three months ended September 30, 2017, primarily due to (i) lower throughput at the Springfield oil gathering system, (ii) lower distributions received from the Mont Belvieu JV and (iii) the start-up of operations at the DBM water systems during the second quarter of 2017. Adjusted gross margin per Bbl for crude, NGL and produced water assets decreased by $0.05 for the nine months ended September 30, 2017, primarily due to (i) lower throughput at the Springfield oil gathering system and (ii) the start-up of operations at the DBM water systems during the second quarter of 2017. These decreases were partially offset during the three and nine months ended September 30, 2017, by higher distributions received from TEP.

Adjusted EBITDA attributable to Western Gas Partners, LP. WES defines Adjusted EBITDA attributable to Western Gas Partners, LP (“Adjusted EBITDA”) as net income (loss) attributable to Western Gas Partners, LP, plus distributions from equity investments, non-cash equity-based compensation expense, interest expense, income tax expense, depreciation and amortization, impairments, and other expense (including lower of cost or market inventory adjustments recorded in cost of product), less gain (loss) on divestiture and other, net, income from equity investments, interest income, income tax benefit, and other income. WES believes that the presentation of Adjusted EBITDA provides information useful to investors in assessing its financial condition and results of operations and that Adjusted EBITDA is a widely accepted financial indicator of a company’s ability to incur and service debt, fund capital expenditures and make distributions. Adjusted EBITDA is a supplemental financial measure that WES’s management and external users of WES’s consolidated financial statements, such as industry analysts, investors, commercial banks and rating agencies, use to assess the following, among other measures:

• WES’s operating performance as compared to other publicly traded partnerships in the midstream energy industry, without regard to financing methods, capital structure or historical cost basis;

• the ability of WES’s assets to generate cash flow to make distributions; and

• the viability of acquisitions and capital expenditure projects and the returns on investment of various investment opportunities.

Adjusted EBITDA decreased by $20.3 million for the three months ended September 30, 2017, primarily due to a $93.6 millionincrease in cost of product (net of lower of cost or market inventory adjustments), a $13.7 milliondecrease in business interruption proceeds, a $4.8 millionincrease in operation and maintenance expenses, and a $1.7 millionincrease in net income attributable to noncontrolling interest. These amounts were partially offset by a $93.1 millionincrease in total revenues and other and a $2.0 millionincrease in distributions from equity investments.

Adjusted EBITDA increased by $27.8 million for the nine months ended September 30, 2017, primarily due to a $322.9 millionincrease in total revenues and other, a $13.6 millionincrease in business interruption proceeds and a $4.3 millionincrease in distributions from equity investments. These amounts were partially offset by a $304.8 millionincrease in cost of product (net of lower of cost or market inventory adjustments), a $3.3 millionincrease in operation and maintenance expenses, a $2.4 millionincrease in general and administrative expenses excluding non-cash equity-based compensation expense, and a $2.3 millionincrease in property and other tax expense.

47

Distributable cash flow. WES defines “Distributable cash flow” as Adjusted EBITDA, plus interest income and the net settlement amounts from the sale and/or purchase of natural gas, condensate and NGLs under WES’s commodity price swap agreements to the extent such amounts are not recognized as Adjusted EBITDA, less net cash paid (or to be paid) for interest expense (including amortization of deferred debt issuance costs originally paid in cash, offset by non-cash capitalized interest), maintenance capital expenditures, Series A Preferred unit distributions and income taxes. WES compares Distributable cash flow to the cash distributions WES expects to pay its unitholders. Using this measure, WES’s management can quickly compute the Coverage ratio of distributable cash flow to planned cash distributions. WES believes Distributable cash flow is useful to investors because this measurement is used by many companies, analysts and others in the industry as a performance measurement tool to evaluate WES’s operating and financial performance and compare it with the performance of other publicly traded partnerships.

While Distributable cash flow is a measure WES uses to assess its ability to make distributions to its unitholders, it should not be viewed as indicative of the actual amount of cash that WES has available for distributions or that it plans to distribute for a given period. Furthermore, to the extent Distributable cash flow includes realized amounts recorded as capital contributions from Anadarko attributable to activity under WES’s commodity price swap agreements, it is not a reflection of WES’s ability to generate cash from operations.

Distributable cash flow decreased by $5.5 million for the three months ended September 30, 2017, primarily due to a $20.3 milliondecrease in Adjusted EBITDA and a $4.4 millionincrease in net cash paid for interest expense. These amounts were partially offset by a $14.9 milliondecrease in WES Series A Preferred unit distributions and a $4.7 milliondecrease in cash paid for maintenance capital expenditures.

Distributable cash flow increased by $67.0 million for the nine months ended September 30, 2017, primarily due to a $27.8 millionincrease in Adjusted EBITDA, a $23.4 milliondecrease in WES Series A Preferred unit distributions, a $22.2 milliondecrease in cash paid for maintenance capital expenditures and an $11.9 millionincrease in the above-market component of the swap agreements with Anadarko. These amounts were partially offset by an $18.3 millionincrease in net cash paid for interest expense.

Reconciliation of non-GAAP measures.Adjusted gross margin, Adjusted EBITDA and Distributable cash flow are not defined in GAAP. The GAAP measure used by WES that is most directly comparable to Adjusted gross margin is operating income (loss), while net income (loss) attributable to Western Gas Partners, LP and net cash provided by operating activities are the GAAP measures used by WES that are most directly comparable to Adjusted EBITDA. The GAAP measure used by WES that is most directly comparable to Distributable cash flow is net income (loss) attributable to Western Gas Partners, LP. WES’s non-GAAP financial measures of Adjusted gross margin, Adjusted EBITDA and Distributable cash flow should not be considered as alternatives to the GAAP measures of operating income (loss), net income (loss) attributable to Western Gas Partners, LP, net cash provided by operating activities or any other measure of financial performance presented in accordance with GAAP. Adjusted gross margin, Adjusted EBITDA and Distributable cash flow have important limitations as analytical tools because they exclude some, but not all, items that affect operating income (loss), net income (loss) attributable to Western Gas Partners, LP and net cash provided by operating activities. Adjusted gross margin, Adjusted EBITDA and Distributable cash flow should not be considered in isolation or as a substitute for analysis of WES’s results as reported under GAAP. WES’s definitions of Adjusted gross margin, Adjusted EBITDA and Distributable cash flow may not be comparable to similarly titled measures of other companies in WES’s industry, thereby diminishing their utility.

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WES’s management compensates for the limitations of Adjusted gross margin, Adjusted EBITDA and Distributable cash flow as analytical tools by reviewing the comparable GAAP measures, understanding the differences between Adjusted gross margin, Adjusted EBITDA and Distributable cash flow compared to (as applicable) operating income (loss), net income (loss) attributable to Western Gas Partners, LP and net cash provided by operating activities, and incorporating this knowledge into its decision-making processes. WES believes that investors benefit from having access to the same financial measures that its management uses in evaluating its operating results.

The following tables present (a) a reconciliation of the GAAP financial measure of operating income (loss) to the non-GAAP financial measure of Adjusted gross margin, (b) a reconciliation of the GAAP financial measures of net income (loss) attributable to Western Gas Partners, LP and net cash provided by operating activities to the non-GAAP financial measure of Adjusted EBITDA and (c) a reconciliation of the GAAP financial measure of net income (loss) attributable to Western Gas Partners, LP to the non-GAAP financial measure of Distributable cash flow:

	Three Months Ended   September 30,					Nine Months Ended   September 30,
thousands	2017		2016			2017		2016
Reconciliation of Operating income (loss) to Adjusted gross margin attributable to Western Gas Partners, LP
Operating income (loss)	$	179,456	$	197,288		$	525,456	$	527,053
Add:
Distributions from equity investments	29,145		27,133			80,568		76,263
Operation and maintenance	79,536		74,755			229,444		226,141
General and administrative	12,158		11,382			35,402		33,542
Property and other taxes	11,215		10,670			35,433		33,098
Depreciation and amortization	72,539		67,246			216,272		199,646
Impairments	2,159		2,392			170,079		11,313
Less:
Gain (loss) on divestiture and other, net	72		(6,230		)	135,017		(8,769		)
Proceeds from business interruption insurance claims	—		13,667			29,882		16,270
Equity income, net – affiliates	21,519		20,294			62,708		56,801
Reimbursed electricity-related charges recorded as revenues	14,323		15,170			42,338		45,707
Adjusted gross margin attributable to noncontrolling interest	5,878		3,984			13,189		12,588
Adjusted gross margin attributable to Western Gas Partners, LP	$	344,416	$	343,981		$	1,009,520	$	984,459
Adjusted gross margin attributable to Western Gas Partners, LP for natural gas assets	$	305,337	$	306,393		$	904,620	$	877,583
Adjusted gross margin for crude, NGL and produced water assets	39,079		37,588			104,900		106,876

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	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Reconciliation of Net income (loss) attributable to Western Gas Partners, LP to Adjusted EBITDA attributable to Western Gas Partners, LP
Net income (loss) attributable to Western Gas Partners, LP	$	143,506		$	167,746		$	418,846		$	448,327
Add:
Distributions from equity investments	29,145			27,133			80,568			76,263
Non-cash equity-based compensation expense	1,258			1,469			3,479			4,018
Interest expense	35,544			30,768			106,794			75,687
Income tax expense	510			472			4,905			7,431
Depreciation and amortization (1)	71,812			66,589			214,213			197,678
Impairments	2,159			2,392			170,079			11,313
Other expense (1)	—			40			140			96
Less:
Gain (loss) on divestiture and other, net	72			(6,230		)	135,017			(8,769		)
Equity income, net – affiliates	21,519			20,294			62,708			56,801
Interest income – affiliates	4,225			4,225			12,675			12,675
Other income (1)	283			150			960			272
Adjusted EBITDA attributable to Western Gas Partners, LP	$	257,835		$	278,170		$	787,664		$	759,834
Reconciliation of Net cash provided by operating activities to Adjusted EBITDA attributable to Western Gas Partners, LP
Net cash provided by operating activities	$	211,947		$	263,872		$	645,099		$	657,738
Interest (income) expense, net	31,319			26,543			94,119			63,012
Uncontributed cash-based compensation awards	78			290			(94		)	448
Accretion and amortization of long-term obligations, net	(1,055		)	121			(3,194		)	9,176
Current income tax (benefit) expense	395			131			1,023			5,110
Other (income) expense, net	(286		)	(153		)	(969		)	(224		)
Distributions from equity investments in excess of cumulative earnings – affiliates	7,034			5,981			16,255			16,592
Changes in operating working capital of Western Gas Partners, LP:
Accounts receivable, net	56,335			7,866			46,972			41,108
Accounts and imbalance payables and accrued liabilities, net	(45,982		)	(26,330		)	(4,007		)	(24,103		)
Other	3,181			3,184			3,065			1,445
Adjusted EBITDA attributable to noncontrolling interest of Western Gas Partners, LP	(5,131		)	(3,335		)	(10,605		)	(10,468		)
Adjusted EBITDA attributable to Western Gas Partners, LP	$	257,835		$	278,170		$	787,664		$	759,834
Cash flow information of Western Gas Partners, LP
Net cash provided by operating activities							$	645,099		$	657,738
Net cash used in investing activities							(514,797		)	(1,040,692		)
Net cash provided by (used in) financing activities							(335,792		)	429,368

⁽¹⁾  Includes WES’s 75% share of depreciation and amortization; other expense; and other income attributable to the Chipeta complex.

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	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands except Coverage ratio	2017			2016			2017			2016
Reconciliation of Net income (loss) attributable to Western Gas Partners, LP to Distributable cash flow and calculation of the Coverage ratio
Net income (loss) attributable to Western Gas Partners, LP	$	143,506		$	167,746		$	418,846		$	448,327
Add:
Distributions from equity investments	29,145			27,133			80,568			76,263
Non-cash equity-based compensation expense	1,258			1,469			3,479			4,018
Non-cash settled - interest expense, net (1)	—			(1,173		)	71			(12,097		)
Income tax (benefit) expense	510			472			4,905			7,431
Depreciation and amortization (2)	71,812			66,589			214,213			197,678
Impairments	2,159			2,392			170,079			11,313
Above-market component of swap agreements with Anadarko (3)	18,049			18,417			46,719			34,782
Other expense (2)	—			40			140			96
Less:
Gain (loss) on divestiture and other, net	72			(6,230		)	135,017			(8,769		)
Equity income, net – affiliates	21,519			20,294			62,708			56,801
Cash paid for maintenance capital expenditures (2)	10,591			15,306			33,115			55,288
Capitalized interest	2,115			1,343			3,991			4,674
Cash paid for (reimbursement of) income taxes	—			—			189			67
Series A Preferred unit distributions	—			14,907			7,453			30,876
Other income (2)	283			150			960			272
Distributable cash flow	$	231,859		$	237,315		$	695,587		$	628,602
Distributions declared(4)
Limited partners of WES – common units	$	138,105					$	397,850
General partner of WES	73,933						210,432
Total	$	212,038					$	608,282
Coverage ratio	1.09		x				1.14		x

⁽¹⁾  Includes amounts related to the Deferred purchase price obligation - Anadarko. See Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽²⁾  Includes WES’s 75% share of depreciation and amortization; other expense; cash paid for maintenance capital expenditures; and other income attributable to the Chipeta complex.

⁽³⁾  See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

⁽⁴⁾  Reflects WES cash distributions of $0.905 and $2.670 per unit declared for the three and nine months ended September 30, 2017, respectively.

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LIQUIDITY AND CAPITAL RESOURCES

WES’s primary cash requirements are for acquisitions and capital expenditures, debt service, customary operating expenses, quarterly distributions to its limited partners and to WES GP, and distributions to its noncontrolling interest owner. WES’s sources of liquidity as of September 30, 2017, included cash and cash equivalents, cash flows generated from operations, interest income on WES’s $260.0 million note receivable from Anadarko, available borrowing capacity under the WES RCF, and issuances of additional equity or debt securities. WES believes that cash flows generated from these sources will be sufficient to satisfy its short-term working capital requirements and long-term maintenance and expansion capital expenditure requirements. The amount of future distributions to unitholders will depend on its results of operations, financial condition, capital requirements and other factors, including the extension of WES’s commodity price swap agreements, and will be determined by WES GP’s Board of Directors on a quarterly basis. Due to WES’s cash distribution policy, WES expects to rely on external financing sources, including equity and debt issuances, to fund expansion capital expenditures and future acquisitions. However, to limit interest expense, WES may use operating cash flows to fund expansion capital expenditures or acquisitions, which could result in subsequent borrowings under the WES RCF to pay distributions or fund other short-term working capital requirements.

During the second quarter of 2017, WES reached a settlement with insurers related to the insurance claim filed for the incident at the DBM complex and final proceeds were received. Recoveries from the business interruption claim related to the DBM outage were recognized as income when cash proceeds were received from insurers. During the nine months ended September 30, 2017, WES received $52.9 million in cash proceeds from insurers in final settlement of its claims related to the incident at the DBM complex, including $29.9 million for business interruption insurance claims and $23.0 million for property insurance claims (see Note 1—Description of Business and Basis of Presentation in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q).

WES has made cash distributions to its unitholders each quarter since its IPO and has increased its quarterly distribution each quarter since the second quarter of 2009. The Board of Directors of WES GP declared a cash distribution to WES unitholders for the third quarter of 2017 of $0.905 per unit, or $212.0 million in aggregate, including incentive distributions, but excluding distributions on WES’s Class C units. The cash distribution is payable on November 13, 2017, to WES unitholders of record at the close of business on November 2, 2017. In connection with the closing of the DBM acquisition in November 2014, WES issued Class C units that will receive distributions in the form of additional Class C units until March 1, 2020, unless earlier converted (see Note 3—Partnership Distributions in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q). The Class C unit distribution, if paid in cash, would have been $11.7 million for the third quarter of 2017.

WES’s management continuously monitors its leverage position and coordinates its capital expenditure program, quarterly distributions and acquisition strategy with its expected cash flows and projected debt-repayment schedule. WES’s management will continue to evaluate funding alternatives, including additional borrowings and the issuance of debt or equity securities, to secure funds as needed or to refinance outstanding debt balances with longer term notes. To facilitate a potential debt or equity securities issuance, WES has the ability to sell securities under its shelf registration statements. WES’s ability to generate cash flows is subject to a number of factors, some of which are beyond its control. Read Risk Factors under Part II, Item 1A of this Form 10-Q.

Working capital. As of September 30, 2017, WES had a $35.0 million working capital deficit, which it defines as the amount by which current liabilities exceed current assets. Working capital is an indication of liquidity and potential need for short-term funding. Working capital requirements are driven by changes in accounts receivable and accounts payable and factors such as credit extended to, and the timing of collections from, WES’s customers, and the level and timing of its spending for maintenance and expansion activity. WES’s working capital deficit as of September 30, 2017, was primarily due to the costs incurred related to continued construction and expansion at the DBM and DJ Basin complexes and the DBJV system. As of September 30, 2017, WES had $945.4 million available for borrowing under the WES RCF. See Note 9—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

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Capital expenditures. WES’s business is capital intensive, requiring significant investment to maintain and improve existing facilities or develop new midstream infrastructure. WES categorizes capital expenditures as either of the following: 

• maintenance capital expenditures, which include those expenditures required to maintain the existing operating capacity and service capability of WES’s assets, such as to replace system components and equipment that have been subject to significant use over time, become obsolete or reached the end of their useful lives, to remain in compliance with regulatory or legal requirements or to complete additional well connections to maintain existing system throughput and related cash flows (for fiscal year 2017, WES GP’s Board of Directors has approved Estimated Maintenance Capital Expenditures (as defined in WES’s partnership agreement) of $18.0 million per quarter); or

• expansion capital expenditures, which include expenditures to construct new midstream infrastructure and those expenditures incurred to extend the useful lives of WES’s assets, reduce costs, increase revenues or increase system throughput or capacity from current levels, including well connections that increase existing system throughput.

Capital expenditures in the consolidated statements of cash flows reflect capital expenditures on a cash basis, when payments are made. Capital incurred is presented on an accrual basis. WES’s capital expenditures as presented in the consolidated statements of cash flows and capital incurred were as follows:

	Nine Months Ended   September 30,
thousands	2017		2016
Acquisitions	$	159,208	$	716,465
Expansion capital expenditures	$	384,416	$	312,505
Maintenance capital expenditures	33,391		55,293
Total capital expenditures (1) (2)	$	417,807	$	367,798
Capital incurred (2)	$	504,286	$	355,674

⁽¹⁾  Capital expenditures for the nine months ended September 30, 2017 and 2016, are presented net of $1.4 million and $4.9 million, respectively, of contributions in aid of construction costs from affiliates.

⁽²⁾  For the nine months ended September 30, 2017 and 2016, included $4.0 million and $4.7 million, respectively, of capitalized interest.

Acquisitions during 2017 included the Additional DBJV System Interest and equipment purchases from Anadarko. Acquisitions during 2016 included Springfield and equipment purchases from Anadarko. See Note 2—Acquisitions and Divestitures and Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Capital expenditures, excluding acquisitions, increased by $50.0 million for the nine months ended September 30, 2017. Expansion capital expenditures increased by $71.9 million (including a $0.7 milliondecrease in capitalized interest) for the nine months ended September 30, 2017, primarily due to an increase of (i) $70.4 million at the DBJV system and $23.7 million at the DJ Basin complex, both due to pipe and compression projects and (ii) an increase of $50.9 million due to the construction of the DBM water system. These increases were partially offset by decreases of $60.3 million at the DBM complex and $9.9 million at the Haley system. Maintenance capital expenditures decreased by $21.9 million for the nine months ended September 30, 2017, primarily at the DBM complex due to repairs made in 2016 as a result of the DBM outage and at the Non-Operated Marcellus Interest systems due to the Property Exchange in March 2017.

WES has updated its estimated total capital expenditures for the year ending December 31, 2017, (including its 75% share of Chipeta’s capital expenditures and excluding acquisitions) from an originally reported $900.0 million to $1.0 billion, to a current range of $800.0 million to $850.0 million. WES has also updated its estimated maintenance capital expenditures from an originally reported $60.0 million to $80.0 million, to a current range of $50.0 million to $55.0 million. Based on the midpoint of the ranges, the total capital expenditure and maintenance capital expenditure estimates represent decreases of 13% and 25%, respectively, from the initial 2017 estimates due to increased capital efficiency and shifting capital spending into later periods.

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WES’s historical cash flow. The following table and discussion present a summary of WES’s net cash flows provided by (used in) operating activities, investing activities and financing activities:

	Nine Months Ended   September 30,
thousands	2017			2016
Net cash provided by (used in):
Operating activities	$	645,099		$	657,738
Investing activities	(514,797		)	(1,040,692		)
Financing activities	(335,792		)	429,368
Net increase (decrease) in cash and cash equivalents	$	(205,490	)	$	46,414

Operating Activities. Net cash provided by operating activities for the nine months ended September 30, 2017, decreased primarily due to the impact of changes in working capital items. Also, for a discussion of WES’s results of operations as compared to the prior period, refer to Operating Results within this Item 2.

Investing Activities. Net cash used in investing activities for the nine months ended September 30, 2017, included the following:

• $417.8 million of capital expenditures, net of $1.4 million of contributions in aid of construction costs from affiliates, primarily related to construction and expansion at the DBM and DJ Basin complexes and the DBJV system;

• $155.3 million of cash consideration paid as part of the Property Exchange;

• $3.9 million of cash paid for equipment purchases from Anadarko;

• $23.3 million of net proceeds from the sale of the Helper and Clawson systems in Utah;

• $23.0 million of proceeds from property insurance claims attributable to the DBM outage; and

• $16.3 million of distributions from equity investments in excess of cumulative earnings.

Net cash used in investing activities for the nine months ended September 30, 2016, included the following:

• $712.5 million of cash paid for the acquisition of Springfield;

• $367.8 million of capital expenditures, net of $4.9 million of contributions in aid of construction costs from affiliates, primarily related to plant construction and expansion at the DBM and DJ Basin complexes and the DBJV system;

• $4.0 million of cash paid for equipment purchases from Anadarko;

• $16.6 million of distributions from equity investments in excess of cumulative earnings; and

• $18.4 million of proceeds from property insurance claims attributable to the DBM outage.

Financing Activities. Net cash used in financing activities for the nine months ended September 30, 2017, included the following:

• $589.3 million of distributions paid to WES unitholders;

• $37.3 million of cash paid to Anadarko for the settlement of WES’s Deferred purchase price obligation - Anadarko;

• $9.0 million of distributions paid to the noncontrolling interest owner of Chipeta;

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• $250.0 million of borrowings under the WES RCF, which were used for WES’s general partnership purposes; and

• $46.7 million of capital contribution from Anadarko related to the above-market component of swap agreements.

Net cash provided by financing activities for the nine months ended September 30, 2016, included the following:

• $880.0 million of repayments of outstanding borrowings under the WES RCF;

• $490.3 million of distributions paid to WES unitholders;

• $29.3 million of net distributions paid to Anadarko representing pre-acquisition intercompany transactions attributable to Springfield;

• $11.3 million of distributions paid to the noncontrolling interest owner of Chipeta;

• $600.0 million of borrowings under the WES RCF, which were used to fund a portion of the Springfield acquisition and for WES’s general partnership purposes, including funding capital expenditures;

• $494.6 million of net proceeds from the WES 2026 Notes offering in July 2016, after underwriting and original issue discounts and offering costs, all of which was used to repay a portion of the outstanding borrowings under the WES RCF;

• $440.0 million of net proceeds from the issuance of 14,030,611 WES Series A Preferred units in March 2016, all of which was used to fund a portion of the acquisition of Springfield;

• $246.9 million of net proceeds from the issuance of 7,892,220 WES Series A Preferred units in April 2016, all of which was used to pay down amounts borrowed under the WES RCF in connection with the acquisition of Springfield;

• $25.0 million of net proceeds from the sale of WES common units to WGP, all of which was used to fund a portion of the acquisition of Springfield; and

• $34.8 million of capital contribution from Anadarko related to the above-market component of swap agreements.

Debt and credit facility. At September 30, 2017, WES’s debt consisted of $500.0 million aggregate principal amount of the 2021 Notes, $670.0 million aggregate principal amount of the 2022 Notes, $350.0 million aggregate principal amount of the 2018 Notes, $600.0 million aggregate principal amount of the 2044 Notes, $500.0 million aggregate principal amount of the 2025 Notes, $500.0 million aggregate principal amount of the 2026 Notes and $250.0 million of borrowings outstanding under the WES RCF. As of September 30, 2017, the carrying value of WES’s outstanding debt was $3.3 billion. See Note 9—Debt and Interest Expense in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

WES Senior Notes. The 2018 Notes, which are due in August 2018, were classified as long-term debt on the consolidated balance sheet at September 30, 2017, as WES has the ability and intent to refinance these obligations using long-term debt. At September 30, 2017, WES was in compliance with all covenants under the indentures governing its outstanding notes.

WES RCF. As of September 30, 2017, WES had $250.0 million of outstanding WES RCF borrowings and $4.6 million in outstanding letters of credit, resulting in $945.4 million available for borrowing under the WES RCF, which matures in February 2020. At September 30, 2017, the interest rate on the WES RCF was 2.54%, the facility fee rate was 0.20% and WES was in compliance with all covenants under the WES RCF.

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Deferred purchase price obligation - Anadarko.Prior to WES’s agreement with Anadarko to settle its deferred purchase price obligation early, the consideration that would have been paid by WES for the March 2015 acquisition of DBJV from Anadarko, consisted of a cash payment to Anadarko due on March 31, 2020. The cash payment would have been equal to (a) eight multiplied by the average of WES’s share in the Net Earnings (see definition below) of DBJV for the calendar years 2018 and 2019, less (b) WES’s share of all capital expenditures incurred for DBJV between March 1, 2015, and February 29, 2020. Net Earnings was defined as all revenues less cost of product, operating expenses and property taxes, in each case attributable to DBJV on an accrual basis. In May 2017, WES reached an agreement with Anadarko to settle this obligation whereby WES made a cash payment to Anadarko of $37.3 million, equal to the estimated net present value of the obligation at March 31, 2017. See Note 2—Acquisitions and Divestitures in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Securities. WES may issue an indeterminate amount of common units and various debt securities under its effective shelf registration statement on file with the SEC. WES may also issue common units under its $500.0 million COP, in amounts, at prices and on terms to be determined by market conditions and other factors at the time of WES’s offerings.

WES has an effective registration statement with the SEC relating to the public resale of the WES common units issued upon conversion of the WES Series A Preferred units. See Note 4—Equity and Partners’ Capital in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for a discussion of the WES Series A Preferred units.

Credit risk. As stated above, our assets consist solely of ownership interests in WES. Accordingly, we are dependent upon WES’s ability to pay cash distributions to us. WES bears credit risk represented by its exposure to non-payment or non-performance by its counterparties, including Anadarko, financial institutions, customers and other parties. Generally, non-payment or non-performance results from a customer’s inability to satisfy payables to WES for services rendered or volumes owed pursuant to gas imbalance agreements. WES examines and monitors the creditworthiness of third-party customers and may establish credit limits for third-party customers.

WES is dependent upon a single producer, Anadarko, for a substantial portion of its volumes (excluding equity investment throughput), and WES does not maintain a credit limit with respect to Anadarko. Consequently, WES is subject to the risk of non-payment or late payment by Anadarko for gathering, processing and transportation fees and for proceeds from the sale of residue, NGLs and condensate to Anadarko.

WES expects its exposure to concentrated risk of non-payment or non-performance to continue for as long as it remains substantially dependent on Anadarko for its revenues. Additionally, WES is exposed to credit risk on the note receivable from Anadarko. WES is also party to agreements with Anadarko under which Anadarko is required to indemnify WES for certain environmental claims, losses arising from rights-of-way claims, failures to obtain required consents or governmental permits and income taxes with respect to the assets acquired from Anadarko. Finally, WES has entered into various commodity price swap agreements with Anadarko in order to reduce its exposure to a majority of the commodity price risk inherent in its percent-of-proceeds and keep-whole contracts, and is subject to performance risk thereunder. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

WES’s ability to make distributions to its unitholders may be adversely impacted if Anadarko becomes unable to perform under the terms of its gathering, processing and transportation agreements, natural gas and NGL purchase agreements, Anadarko’s note payable to WES, the WES omnibus agreement, the services and secondment agreement, contribution agreements or the commodity price swap agreements.

CONTRACTUAL OBLIGATIONS

WES’s contractual obligations include, among other things, a revolving credit facility, other third-party long-term debt, capital obligations related to its expansion projects and various operating leases. Refer toNote 9—Debt and Interest Expense and Note 10—Commitments and Contingencies in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q for an update to WES’s contractual obligations as of September 30, 2017, including, but not limited to, increases in committed capital.

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OFF-BALANCE SHEET ARRANGEMENTS

We do not have any off-balance sheet arrangements. WES does not have any off-balance sheet arrangements other than operating leases and standby letters of credit. The information pertaining to operating leases and WES’s standby letters of credit required for this item is provided under Note 10—Commitments and Contingencies and Note 9—Debt and Interest Expense, respectively, included in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

RECENT ACCOUNTING DEVELOPMENTS

See Note 1—Description of Business and Basis of Presentation in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

Item 3.  Quantitative and Qualitative Disclosures About Market Risk

Commodity price risk. Certain of WES’s processing services are provided under percent-of-proceeds and keep-whole agreements in which Anadarko is typically responsible for the marketing of the natural gas, condensate and NGLs. Under percent-of-proceeds agreements, WES receives a specified percentage of the net proceeds from the sale of residue and/or NGLs. Under keep-whole agreements, WES keeps 100% of the NGLs produced and the processed natural gas, or value of the natural gas, is returned to the producer, and since some of the gas is used and removed during processing, WES compensates the producer for the amount of gas used and removed in processing by supplying additional gas or by paying an agreed-upon value for the gas used.

To mitigate WES’s exposure to a majority of the commodity price risk inherent in its percent-of-proceeds and keep-whole contracts, WES currently has in place commodity price swap agreements with Anadarko covering activity at the DJ Basin complex and the MGR assets. On December 1, 2016, WES renewed these commodity price swap agreements through December 31, 2017, with an effective date of January 1, 2017. See Note 5—Transactions with Affiliates in the Notes to Consolidated Financial Statements under Part I, Item 1 of this Form 10-Q.

We consider WES’s exposure to commodity price risk associated with the above-described arrangements to be minimal given the existence of the commodity price swap agreements with Anadarko and the relatively small amount of WES’s operating income (loss) that is impacted by changes in market prices. Accordingly, WES does not expect that a 10% increase or decrease in commodity prices would have a material impact on WES’s operating income (loss), financial condition or cash flows for the next twelve months, excluding the effect of imbalances described below.

We bear a limited degree of commodity price risk through our investment in WES with respect to settlement of WES’s natural gas imbalances that arise from differences in gas volumes received into WES’s systems and gas volumes delivered by WES to customers, as well as instances where WES’s actual liquids recovery or fuel usage varies from the contractually stipulated amounts. Natural gas volumes owed to or by WES that are subject to monthly cash settlement are valued according to the terms of the contract as of the balance sheet dates, and generally reflect market index prices. Other natural gas volumes owed to or by WES are valued at WES’s weighted-average cost of natural gas as of the balance sheet dates and are settled in-kind. WES’s exposure to the impact of changes in commodity prices on outstanding imbalances depends on the timing of settlement of the imbalances.

Interest rate risk. In June 2017, the Federal Open Market Committee raised the target range for the federal funds rate from 3/4 to one percent to one to 1 1/4 percent. This increase, and any future increases, in the federal funds rate will ultimately result in an increase in financing costs. As of September 30, 2017, WGP had $28.0 million of borrowings under the WGP RCF and WES had $250.0 million of outstanding borrowings under the WES RCF. The WGP RCF and WES RCF each bear interest at a rate based on LIBOR or an alternative base rate at WGP’s or WES’s option, respectively. A 10% change in LIBOR would have resulted in a nominal change in net income (loss) and the fair value of any borrowings under the WES RCF and WGP RCF at September 30, 2017.

Additional variable-rate debt may be incurred in the future, either under the WES RCF, WGP RCF or other financing sources, including commercial bank borrowings or debt issuances.

57

Item 4.  Controls and Procedures

Evaluation of Disclosure Controls and Procedures. The Chief Executive Officer and Chief Financial Officer of WGP’s general partner (for purposes of this Item 4, “Management”) performed an evaluation of WGP’s disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act. Our disclosure controls and procedures are designed to ensure that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC, and to ensure that the information required to be disclosed by us in reports that we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure. Based on this evaluation, Management concluded that WGP’s disclosure controls and procedures were effective as of September 30, 2017.

Changes in Internal Control Over Financial Reporting. There has been no change in our internal control over financial reporting during the quarter ended September 30, 2017, that has materially affected, or is reasonably likely to materially affect, WGP’s internal control over financial reporting.

PART II.OTHER INFORMATION

Item 1.  Legal Proceedings

Kerr-McGee Gathering LLC (“KMGG”), one of WES’s wholly owned subsidiaries, is currently in negotiations with the U.S. Environmental Protection Agency (the “EPA”) and the Department of Justice with respect to alleged non-compliance with the leak detection and repair requirements of the federal Clean Air Act at its Fort Lupton facility in the DJ Basin complex.

Also, WGR Operating, LP, another wholly owned subsidiary of WES, is currently in negotiations with the EPA with respect to alleged non-compliance with the leak detection and repair requirements of the federal Clean Air Act at its Granger, Wyoming facility. Although WES’s management cannot predict the outcome of settlement discussions in these matters, WES’s management believes that it is reasonably likely a resolution of these matters will result in a fine or penalty for each matter in excess of $100,000.

We are not engaged in any material litigation. Except as discussed above, WES is not a party to any legal, regulatory or administrative proceedings other than proceedings arising in the ordinary course of its business. WES’s management believes that there are no such proceedings for which a final disposition could have a material adverse effect on its results of operations, cash flows or financial condition, or for which disclosure is otherwise required by Item 103 of Regulation S-K.

Item 1A.  Risk Factors

Security holders and potential investors in our securities should carefully consider the risk factors set forth under Part I, Item 1A in our Form 10-K for the year ended December 31, 2016, together with all of the other information included in this document, and in our other public filings, press releases and public discussions with management. Additionally, for a full discussion of the risks associated with Anadarko’s business, see Item 1A under Part I in Anadarko’s Form 10-K for the year ended December 31, 2016, Anadarko’s quarterly reports on Form 10-Q and Anadarko’s other public filings, press releases and public discussions with Anadarko management. We have identified these risk factors as important factors that could cause our actual results to differ materially from those contained in any written or oral forward-looking statements made by us or on our behalf.

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Item 6.  Exhibits

Exhibits designated by an asterisk (*) are filed herewith and those designated with asterisks (**) are furnished herewith; all exhibits not so designated are incorporated herein by reference to a prior filing as indicated.

Exhibit Number	Description
2.1#	Contribution, Conveyance and Assumption Agreement by and among Western Gas Partners, LP, Western Gas Holdings, LLC, Anadarko Petroleum Corporation, WGR Holdings, LLC, Western Gas Resources, Inc., WGR Asset Holding Company LLC, Western Gas Operating, LLC and WGR Operating, LP, dated as of May 14, 2008 (incorporated by reference to Exhibit 10.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 14, 2008, File No. 001-34046).
2.2#	Contribution Agreement, dated as of November 11, 2008, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 10.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on November 13, 2008, File No. 001-34046).
2.3#	Contribution Agreement, dated as of July 10, 2009, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, Anadarko Uintah Midstream, LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on July 23, 2009, File No. 001-34046).
2.4#	Contribution Agreement, dated as of January 29, 2010 by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, Mountain Gas Resources LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on February 3, 2010 File No. 001-34046).
2.5#	Contribution Agreement, dated as of July 30, 2010, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 5, 2010, File No. 001-34046).
2.6#	Purchase and Sale Agreement, dated as of January 14, 2011, by and among Western Gas Partners, LP, Kerr-McGee Gathering LLC and Encana Oil & Gas (USA) Inc. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on January 18, 2011 File No. 001-34046).
2.7#	Contribution Agreement, dated as of December 15, 2011, by and among Western Gas Resources, Inc., WGR Asset Holding Company LLC, WGR Holdings, LLC, Western Gas Holdings, LLC, WES GP, Inc., Western Gas Partners, LP, Western Gas Operating, LLC and WGR Operating, LP. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on December 15, 2011, File No. 001-34046).
2.8#	Contribution Agreement, dated as of February 27, 2013, by and among Anadarko Marcellus Midstream, L.L.C., Western Gas Partners, LP, Western Gas Operating, LLC, WGR Operating, LP, Anadarko Petroleum Corporation and Anadarko E&P Onshore LLC (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 5, 2013, File No. 001-34046).
2.9#	Contribution Agreement, dated as of February 27, 2014, by and among WGR Asset Holding Company LLC, APC Midstream Holdings, LLC, Western Gas Partners, LP, Western Gas Operating, LLC, WGR Operating, LP and Anadarko Petroleum Corporation (incorporated by reference to Exhibit 2.9 to Western Gas Partners, LP’s Annual Report on Form 10-K filed on February 28, 2014, File No. 001-34046).
2.10#	Agreement and Plan of Merger, dated October 28, 2014, by and among Western Gas Partners, LP, Maguire Midstream LLC and Nuevo Midstream, LLC (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on October 28, 2014, File No. 001-34046).
2.11#	Purchase and Sale Agreement, dated as of March 2, 2015, by and among WGR Asset Holding Company LLC, Delaware Basin Midstream, LLC, Western Gas Partners, LP, and Anadarko Petroleum Corporation (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 3, 2015, File No. 001-34046).

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Exhibit Number	Description
2.12#	Amendment No. 1 to Purchase and Sale Agreement, dated as of May 22, 2017, by and between WGR Asset Holding Company LLC and Delaware Basin Midstream, LLC (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 23, 2017, File No. 001-34046).
2.13#	Contribution Agreement, dated as of February 24, 2016, by and among WGR Asset Holding Company, LLC, APC Midstream Holdings, LLC, Western Gas Partners, LP, Western Gas Operating, LLC, WGR Operating, LP and Anadarko Petroleum Corporation (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 1, 2016, File No.001-34046).
2.14#	Interest Swap and Purchase Agreement, dated February 9, 2017, among Western Gas Partners, LP, WGR Operating, LP, Delaware Basin JV Gathering, LLC, Williams Partners L.P., Williams Midstream Gas Services LLC and Appalachia Midstream Services, L.L.C. (incorporated by reference to Exhibit 2.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on February 9, 2017, File No. 001-34046).
3.1	Certificate of Limited Partnership of Western Gas Equity Partners, LP (incorporated by reference to Exhibit 3.1 to the Registration Statement on Form S-1 of Western Gas Equity Partners, LP filed on November 5, 2012, File No. 333-184763).
3.2	First Amended and Restated Agreement of Limited Partnership of Western Gas Equity Partners, LP, dated as of December 12, 2012 (incorporated by reference to Exhibit 3.1 to Western Gas Equity Partners, LP’s Current Report on Form 8-K filed on December 12, 2012, File No. 001-35753).
3.3	Certificate of Formation of Western Gas Equity Holdings, LLC (incorporated by reference to Exhibit 3.3 to Western Gas Equity Partners, LP’s Registration Statement on Form S-1 filed on November 5, 2012, File No. 333-184763).
3.4	Amended and Restated Limited Liability Company Agreement of Western Gas Equity Holdings, LLC, dated as of December 12, 2012 (incorporated by reference to Exhibit 3.2 to Western Gas Equity Partners, LP’s Current Report on Form 8-K filed on December 12, 2012, File No. 001-35753).
3.5	Certificate of Limited Partnership of Western Gas Partners, LP (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Registration Statement on Form S-1 filed on October 15, 2007, File No. 333-146700).
3.6	Second Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated March 14, 2016 (incorporated by reference to Exhibit 3.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 16, 2016, File No. 001-34046).
3.7	Amendment No. 1 to Second Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated March 14, 2016 (incorporated by reference to Exhibit 3.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 16, 2016, File No. 001-34046).
3.8	Amendment No. 2 to Second Amended and Restated Agreement of Limited Partnership of Western Gas Partners, LP, dated February 22, 2017 (incorporated by reference to Exhibit 3.4 to Western Gas Partners, LP’s Annual Report on Form 10-K filed on February 23, 2017, File No. 001-34046).
3.9	Certificate of Formation of Western Gas Holdings, LLC (incorporated by reference to Exhibit 3.3 to Western Gas Partners, LP’s Registration Statement on Form S-1 filed on October 15, 2007, File No. 333-146700).
3.10	Second Amended and Restated Limited Liability Company Agreement of Western Gas Holdings, LLC, dated December 12, 2012 (incorporated by reference to Exhibit 3.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on December 12, 2012, File No. 001-34046).
4.1	Specimen Unit Certificate for the Common Units (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Quarterly Report on Form 10-Q filed on June 13, 2008, File No. 001-34046).
4.2	Indenture, dated as of May 18, 2011, among Western Gas Partners, LP, as Issuer, the Subsidiary Guarantors named therein, as Guarantors, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 18, 2011, File No. 001-34046).
4.3	First Supplemental Indenture, dated as of May 18, 2011, among Western Gas Partners, LP, as Issuer, the Subsidiary Guarantors named therein, as Guarantors, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 18, 2011, File No. 001-34046).

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Exhibit Number	Description
4.4	Form of 5.375% Senior Notes due 2021 (incorporated by reference to Exhibit 4.3 to Western Gas Partners, LP’s Current Report on Form 8-K filed on May 18, 2011, File No. 001-34046).
4.5	Fourth Supplemental Indenture, dated as of June 28, 2012, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on June 28, 2012, File No. 001-34046).
4.6	Form of 4.000% Senior Notes due 2022 (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on June 28, 2012, File No. 001-34046).
4.7	Fifth Supplemental Indenture, dated as of August 14, 2013, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 14, 2013, File No. 001-34046).
4.8	Form of 2.600% Senior Notes due 2018 (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on August 14, 2013, File No. 001-34046).
4.9	Sixth Supplemental Indenture, dated as of March 20, 2014, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 20, 2014, File No. 001-34046).
4.10	Form of 5.450% Senior Notes due 2044 (incorporated by reference to Exhibit 4.4 to Western Gas Partners, LP’s Current Report on Form 8-K filed on March 20, 2014, File No. 001-34046).
4.11	Seventh Supplemental Indenture, dated as of June 4, 2015, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on June 4, 2015, File No. 001-34046).
4.12	Form of 3.950% Senior Notes due 2025 (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on June 4, 2015, File No. 001-34046).
4.13	Eighth Supplemental Indenture, dated as of July 12, 2016, among Western Gas Partners, LP, as Issuer, and Wells Fargo Bank, National Association, as Trustee (incorporated by reference to Exhibit 4.1 to Western Gas Partners, LP’s Current Report on Form 8-K filed on July 12, 2016, File No. 001-34046).
4.14	Form of 4.650% Senior Notes due 2026 (incorporated by reference to Exhibit 4.2 to Western Gas Partners, LP’s Current Report on Form 8-K filed on July 12, 2016, File No. 001-34046).
31.1*	Certification of Chief Executive Officer, pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Chief Financial Officer, pursuant to Rule 13a-14(a)/15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	XBRL Instance Document
101.SCH*	XBRL Schema Document
101.CAL*	XBRL Calculation Linkbase Document
101.DEF*	XBRL Definition Linkbase Document
101.LAB*	XBRL Label Linkbase Document
101.PRE*	XBRL Presentation Linkbase Document

# Pursuant to Item 601(b)(2) of Regulation S-K, the registrant agrees to furnish supplementally a copy of any omitted schedule to the Securities and Exchange Commission upon request.

61

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	WESTERN GAS EQUITY PARTNERS, LP
November 1, 2017
	/s/ Benjamin M. Fink
	Benjamin M. Fink President and Chief Executive Officer Western Gas Equity Holdings, LLC (as general partner of Western Gas Equity Partners, LP)
November 1, 2017
	/s/ Jaime R. Casas
	Jaime R. Casas Senior Vice President, Chief Financial Officer and Treasurer Western Gas Equity Holdings, LLC (as general partner of Western Gas Equity Partners, LP)

62

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO RULE 13A-14(A) AND RULE 15D-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Benjamin M. Fink, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Western Gas Equity Partners, LP (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2017

/s/ Benjamin M. Fink

Benjamin M. Fink

President and Chief Executive Officer

Western Gas Equity Holdings, LLC

(as general partner of Western Gas Equity Partners, LP)

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13A-14(A) AND RULE 15D-14(A)

OF THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED

I, Jaime R. Casas, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Western Gas Equity Partners, LP (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 1, 2017

/s/ Jaime R. Casas

Jaime R. Casas

Senior Vice President, Chief Financial Officer and Treasurer
Western Gas Equity Holdings, LLC
(as general partner of Western Gas Equity Partners, LP)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, Benjamin M. Fink, President and Chief Executive Officer of Western Gas Equity Holdings, LLC, the general partner of Western Gas Equity Partners, LP (the “Partnership”) and Jaime R. Casas, Senior Vice President, Chief Financial Officer and Treasurer of Western Gas Equity Holdings, LLC, certify to the best of my knowledge that:

(1) the Quarterly Report on Form 10-Q of the Partnership for the period ending September 30, 2017, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

November 1, 2017
	/s/ Benjamin M. Fink
	Benjamin M. Fink President and Chief Executive Officer Western Gas Equity Holdings, LLC (as general partner of Western Gas Equity Partners, LP)
November 1, 2017
	/s/ Jaime R. Casas
	Jaime R. Casas Senior Vice President, Chief Financial Officer and Treasurer Western Gas Equity Holdings, LLC (as general partner of Western Gas Equity Partners, LP)

The foregoing certifications are being furnished as an exhibit to the Report pursuant to Item 601(b)(32) of Regulation S-K and Section 906 of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and, accordingly, are not being filed as part of the Report for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and are not incorporated by reference into any filing of the Partnership, whether made before or after the date hereof, regardless of any general incorporation language in such filing.

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 30, 2017
Document And Entity Information [Abstract]
Trading Symbol	WGP
Entity Registrant Name	Western Gas Equity Partners, LP
Entity Central Index Key	0001423902
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Units Outstanding		218,933,141

XML

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues and Other
Total revenues and other		$ 574,695	$ 481,645	$ 1,616,338	$ 1,293,450
Equity income, net – affiliates	[1]	21,519	20,294	62,708	56,801
Operating expenses
Cost of product	[2]	239,223	145,643	631,859	326,959
Operation and maintenance	[2]	79,536	74,755	229,444	226,141
General and administrative	[2]	12,922	12,112	37,595	36,514
Property and other taxes		11,215	10,670	35,433	33,113
Depreciation and amortization		72,539	67,246	216,272	199,646
Impairments		2,159	2,392	170,079	11,313
Total operating expenses		417,594	312,818	1,320,682	833,686
Gain (loss) on divestiture and other, net		72	(6,230)	135,017	(8,769)
Proceeds from business interruption insurance claims		0	13,667	29,882	16,270
Operating income (loss)		178,692	196,558	523,263	524,066
Interest income – affiliates	[3]	4,225	4,225	12,675	12,675
Interest expense	[4]	(36,117)	(31,301)	(108,447)	(76,869)
Other income (expense), net		311	165	1,029	270
Income (loss) before income taxes		147,111	169,647	428,520	460,142
Income tax (benefit) expense		510	472	4,905	7,431
Net income (loss)		146,601	169,175	423,615	452,711
Net income (loss) attributable to noncontrolling interests		50,399	77,778	146,529	190,635
Net income (loss) attributable to Western Gas Equity Partners, LP		96,202	91,397	277,086	262,076
Limited partners' interest in net income (loss):
Pre-acquisition net (income) loss allocated to Anadarko		0	0	0	(11,326)
Limited partners' interest in net income (loss)	[5]	96,202	91,397	277,086	250,750
Affiliates [Member]
Revenues and Other
Gathering, processing and transportation		157,303	189,465	484,601	563,916
Natural gas and natural gas liquids sales		185,002	135,847	489,172	336,385
Other		8,822	0	8,822	0
Total revenues and other	[1]	351,127	325,312	982,595	900,301
Operating expenses
Cost of product	[1]	22,902	21,254	60,497	67,979
Operation and maintenance	[6]	18,110	15,052	53,661	50,688
General and administrative	[7]	10,414	9,655	29,637	28,179
Total operating expenses		51,426	45,961	143,795	146,846
Interest expense	[8]	0	1,173	(71)	12,097
Third Parties [Member]
Revenues and Other
Gathering, processing and transportation		148,884	125,727	428,835	346,416
Natural gas and natural gas liquids sales		74,139	28,189	201,318	43,200
Other		545	2,417	3,590	3,533
Total revenues and other		223,568	156,333	633,743	393,149
Operating expenses
Interest expense		$ (36,117)	$ (32,474)	$ (108,376)	$ (88,966)
Limited Partner [Member]
Limited partners' interest in net income (loss):
Net income (loss) per common unit - basic and diluted		$ 0.44	$ 0.42	$ 1.27	$ 1.15
Weighted-average common units outstanding - basic and diluted		218,933	218,922	218,931	218,921

[1] Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[2] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.9 million and $60.5 million for the three and nine months ended September 30, 2017, respectively, and $21.3 million and $68.0 million for the three and nine months ended September 30, 2016, respectively. Operation and maintenance includes charges from Anadarko of $18.1 million and $53.7 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $50.7 million for the three and nine months ended September 30, 2016, respectively. General and administrative includes charges from Anadarko of $10.4 million and $29.6 million for the three and nine months ended September 30, 2017, respectively, and $9.7 million and $28.2 million for the three and nine months ended September 30, 2016, respectively. See Note 5.

[3] Represents interest income recognized on the note receivable from Anadarko.

[4] Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $1.2 million and $12.1 million for the three and nine months ended September 30, 2016, respectively. See Note 2 and Note 9.

[5] Represents net income (loss) earned on and subsequent to the date of acquisition of WES assets (as defined in Note 1). See Note 4.

[6] Represents expenses incurred on and subsequent to the date of the acquisition of WES assets, as well as expenses incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES.

[7] Represents general and administrative expense incurred on and subsequent to the date of WES’s acquisition of WES assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of WES assets by WES. These amounts include equity-based compensation expense allocated to WES and WGP by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plan within this Note 5) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

[8] Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2 and Note 9).

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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cost of product	[1]	$ 239,223	$ 145,643	$ 631,859	$ 326,959
Operation and maintenance	[1]	79,536	74,755	229,444	226,141
General and administrative	[1]	12,922	12,112	37,595	36,514
Interest expense	[2]	(36,117)	(31,301)	(108,447)	(76,869)
Affiliates [Member]
Cost of product	[3]	22,902	21,254	60,497	67,979
Operation and maintenance	[4]	18,110	15,052	53,661	50,688
General and administrative	[5]	10,414	9,655	29,637	28,179
Interest expense	[6]	$ 0	$ 1,173	$ (71)	$ 12,097

[1] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.9 million and $60.5 million for the three and nine months ended September 30, 2017, respectively, and $21.3 million and $68.0 million for the three and nine months ended September 30, 2016, respectively. Operation and maintenance includes charges from Anadarko of $18.1 million and $53.7 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $50.7 million for the three and nine months ended September 30, 2016, respectively. General and administrative includes charges from Anadarko of $10.4 million and $29.6 million for the three and nine months ended September 30, 2017, respectively, and $9.7 million and $28.2 million for the three and nine months ended September 30, 2016, respectively. See Note 5.

[2] Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $1.2 million and $12.1 million for the three and nine months ended September 30, 2016, respectively. See Note 2 and Note 9.

[3] Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[4] Represents expenses incurred on and subsequent to the date of the acquisition of WES assets, as well as expenses incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES.

[5] Represents general and administrative expense incurred on and subsequent to the date of WES’s acquisition of WES assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of WES assets by WES. These amounts include equity-based compensation expense allocated to WES and WGP by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plan within this Note 5) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

[6] Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2 and Note 9).

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Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents		$ 153,036	$ 359,072
Accounts receivable, net	[1]	192,437	223,021
Other current assets		13,497	13,498
Total current assets		358,970	595,591
Note receivable - Anadarko		260,000	260,000
Property, plant and equipment
Cost		7,582,178	6,861,942
Less accumulated depreciation		2,074,464	1,812,010
Net property, plant and equipment		5,507,714	5,049,932
Goodwill		417,610	417,610
Other intangible assets		782,376	803,698
Equity investments		573,622	594,208
Other assets		15,627	15,058
Total assets		7,915,919	7,736,097
Current liabilities
Accounts and imbalance payables	[2]	302,848	247,076
Accrued ad valorem taxes		33,020	23,121
Accrued liabilities	[3]	57,699	45,190
Total current liabilities		393,567	315,387
Long-term debt		3,371,886	3,119,461
Deferred income taxes		10,284	6,402
Asset retirement obligations and other		146,248	142,641
Deferred purchase price obligation - Anadarko	[4]	0	41,440
Total long-term liabilities		3,528,418	3,309,944
Total liabilities		3,921,985	3,625,331
Equity and partners' capital
Common units (218,933,141 and 218,928,570 units issued and outstanding at September 30, 2017, and December 31, 2016, respectively)		1,067,269	1,048,143
Total partners' capital		1,067,269	1,048,143
Noncontrolling interests		2,926,665	3,062,623
Total equity and partners' capital		3,993,934	4,110,766
Total liabilities, equity and partners' capital		$ 7,915,919	$ 7,736,097

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $78.3 million and $76.4 million as of September 30, 2017, and December 31, 2016, respectively. Accounts receivable, net as of December 31, 2016, also includes an insurance claim receivable related to an incident at the DBM complex. See Note 1.

[2] Accounts and imbalance payables includes affiliate amounts of $0.2 million and zero as of September 30, 2017, and December 31, 2016, respectively.

[3] Accrued liabilities includes affiliate amounts of $0.3 million and zero as of September 30, 2017, and December 31, 2016, respectively.

[4] See Note 2.

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Common units issued		218,933,141	218,928,570
Common units outstanding		218,933,141	218,928,570
Accounts receivable, net	[1]	$ 192,437	$ 223,021
Accounts and imbalance payables	[2]	302,848	247,076
Accrued liabilities	[3]	57,699	45,190
Affiliates [Member]
Accounts receivable, net		78,300	76,400
Accounts and imbalance payables		200	0
Accrued liabilities		$ 300	$ 0

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $78.3 million and $76.4 million as of September 30, 2017, and December 31, 2016, respectively. Accounts receivable, net as of December 31, 2016, also includes an insurance claim receivable related to an incident at the DBM complex. See Note 1.

[2] Accounts and imbalance payables includes affiliate amounts of $0.2 million and zero as of September 30, 2017, and December 31, 2016, respectively.

[3] Accrued liabilities includes affiliate amounts of $0.3 million and zero as of September 30, 2017, and December 31, 2016, respectively.

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Consolidated Statement of Equity and Partners' Capital - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands		Total	Western Gas Partners, LP [Member]	Chipeta [Member]	Net Investment by Anadarko [Member]	Common Units [Member]	Noncontrolling Interests [Member]	Noncontrolling Interests [Member] Western Gas Partners, LP [Member]	Noncontrolling Interests [Member] Chipeta [Member]
Balance at Dec. 31, 2016		$ 4,110,766			$ 0	$ 1,048,143	$ 3,062,623
Net income (loss)		423,615			0	277,086	146,529
Above-market component of swap agreements with Anadarko	[1]	46,719				46,719
WES equity transactions, net	[2]	(183)				10,800	(10,983)
Distributions to noncontrolling interest owners			$ (262,888)	$ (9,049)				$ (262,888)	$ (9,049)
Distributions to WGP unitholders		(324,290)				(324,290)
Acquisitions from affiliates		0			(30)	30
Revision to Deferred purchase price obligation – Anadarko	[3]	4,165				4,165
Contributions of equity-based compensation to WES by Anadarko		3,333				3,333
Net pre-acquisition contributions from (distributions to) Anadarko		30			30
Net contributions from (distributions to) Anadarko of other assets		1,373				1,373
Other		343				(90)	433
Balance at Sep. 30, 2017		$ 3,993,934			$ 0	$ 1,067,269	$ 2,926,665

[1] See Note 5.

[2] Includes the impact of WES’s (as defined in Note 1) equity offerings as described in Note 4. The $10.8 million increase to partners’ capital, together with net income (loss) attributable to Western Gas Equity Partners, LP, totaled $287.9 million for the nine months ended September 30, 2017.

[3] See Note 2.

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Consolidated Statement of Equity and Partners' Capital (Parenthetical) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
WES equity transactions, net	$ (183)	[1]
Combined change in Partners' Capital from WES equity transactions, net and net income (loss) attributable to Western Gas Equity Partners, LP	287,900
Common Units [Member]
WES equity transactions, net	$ 10,800	[1]

[1] Includes the impact of WES’s (as defined in Note 1) equity offerings as described in Note 4. The $10.8 million increase to partners’ capital, together with net income (loss) attributable to Western Gas Equity Partners, LP, totaled $287.9 million for the nine months ended September 30, 2017.

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016
Cash flows from operating activities
Net income (loss)		$ 423,615		$ 452,711
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		216,272		199,646
Impairments		170,079		11,313
Non-cash equity-based compensation expense		3,751		3,759
Deferred income taxes		3,882		2,321
Accretion and amortization of long-term obligations, net		3,701		(8,820)
Equity income, net – affiliates	[1]	(62,708)		(56,801)
Distributions from equity investment earnings – affiliates		64,313		59,671
(Gain) loss on divestiture and other, net		(135,017)		8,769
Lower of cost or market inventory adjustments		140		41
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net		(47,137)		(41,266)
Increase (decrease) in accounts and imbalance payables and accrued liabilities, net		4,127		24,227
Change in other items, net		(2,549)		(871)
Net cash provided by operating activities		642,469		654,700
Cash flows from investing activities
Capital expenditures		(419,193)		(372,725)
Investments in equity affiliates		(384)		139
Distributions from equity investments in excess of cumulative earnings – affiliates		16,255	[2]	16,592
Proceeds from property insurance claims		22,977		18,398
Net cash used in investing activities		(514,797)		(1,040,692)
Cash flows from financing activities
Borrowings, net of debt issuance costs		249,989		1,120,580
Repayments of debt		0		(880,000)
Increase (decrease) in outstanding checks		3,310		(1,070)
Distributions to WGP unitholders	[3]	(324,290)		(276,114)
Net contributions from (distributions to) Anadarko		30		(29,335)
Above-market component of swap agreements with Anadarko	[3]	46,719		34,782
Net cash provided by (used in) financing activities		(333,708)		432,646
Net increase (decrease) in cash and cash equivalents		(206,036)		46,654
Cash and cash equivalents at beginning of period		359,072		99,694
Cash and cash equivalents at end of period		153,036		146,348
Supplemental disclosures
Accretion expense and revisions to the Deferred purchase price obligation – Anadarko	[4]	(4,094)		(172,249)
Net distributions to (contributions from) Anadarko of other assets		(1,373)		581
Interest paid, net of capitalized interest		98,956		83,352
Taxes paid		189		67
Accrued capital expenditures		165,732		49,328
Fair value of properties and equipment from non-cash third party transactions	[4]	551,453		0
Chipeta [Member]
Cash flows from financing activities
Distributions to Chipeta noncontrolling interest owner		(9,049)		(11,257)
Western Gas Partners, LP [Member]
Cash flows from financing activities
Proceeds from the issuance of WES common units, net of offering expenses		(183)		0
Distributions to noncontrolling interest owners of WES		(262,888)		(211,877)
Western Gas Partners, LP [Member] | Series A Preferred Units [Member]
Cash flows from financing activities
Proceeds from the issuance of WES Series A Preferred units, net of offering expenses		0		686,937
Affiliates [Member]
Cash flows from investing activities
Contributions in aid of construction costs from affiliates		1,386		4,927
Acquisitions		(3,910)		(716,465)
Proceeds from the sale of assets		0		623
Cash flows from financing activities
Settlement of the Deferred purchase price obligation - Anadarko	[4]	(37,346)		0
Distributions to WGP unitholders	[5]	(264,533)		(235,587)
Affiliates [Member] | Western Gas Partners, LP [Member]
Cash flows from financing activities
Distributions to WGP unitholders	[6]	(5,280)		(3,915)
Third Parties [Member]
Cash flows from investing activities
Acquisitions		(155,298)		0
Proceeds from the sale of assets		$ 23,370		$ 7,819

[1] Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[2] Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

[3] See Note 5.

[4] See Note 2.

[5] Represents distributions paid under WGP’s partnership agreement (see Note 3 and Note 4).

[6] Represents distributions paid to other subsidiaries of Anadarko under WES’s partnership agreement (see Note 3 and Note 4).

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Description of Business and Basis of Presentation

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Description of Business and Basis of Presentation

General. Western Gas Equity Partners, LP is a Delaware master limited partnership (“MLP”) formed in September 2012 to own three types of partnership interests in Western Gas Partners, LP. Western Gas Equity Partners, LP was formed by converting WGR Holdings, LLC into a limited partnership and changing its name. Western Gas Partners, LP (together with its subsidiaries, “WES”) is a Delaware MLP formed by Anadarko Petroleum Corporation in 2007 to acquire, own, develop and operate midstream energy assets.

For purposes of these consolidated financial statements, “WGP” refers to Western Gas Equity Partners, LP in its individual capacity or to Western Gas Equity Partners, LP and its subsidiaries, including Western Gas Holdings, LLC and WES, as the context requires. “WES GP” refers to Western Gas Holdings, LLC, individually as the general partner of WES, and excludes WES. WGP’s general partner, Western Gas Equity Holdings, LLC (“WGP GP”), is a wholly owned subsidiary of Anadarko Petroleum Corporation. WES GP owns all of the general partner interest in WES, which constitutes substantially all of its business, which primarily is to manage the affairs and operations of WES. Refer to Note 4 for a discussion of WGP’s holdings of WES equity. “Anadarko” refers to Anadarko Petroleum Corporation and its subsidiaries, excluding WGP and WGP GP, and “affiliates” refers to subsidiaries of Anadarko, excluding WGP, but including equity interests in Fort Union Gas Gathering, LLC (“Fort Union”), White Cliffs Pipeline, LLC (“White Cliffs”), Rendezvous Gas Services, LLC (“Rendezvous”), Enterprise EF78 LLC (the “Mont Belvieu JV”), Texas Express Pipeline LLC (“TEP”), Texas Express Gathering LLC (“TEG”) and Front Range Pipeline LLC (“FRP”). The interests in TEP, TEG and FRP are referred to collectively as the “TEFR Interests.” “MGR assets” refers to the Red Desert complex and the Granger straddle plant.

WES is engaged in the business of gathering, compressing, treating, processing and transporting natural gas; gathering, stabilizing and transporting condensate, natural gas liquids (“NGLs”) and crude oil; and gathering and disposing of produced water. WES provides these midstream services for Anadarko, as well as for third-party producers and customers. As of September 30, 2017, WES’s assets and investments consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Gathering systems	12	3	3	2
Treating facilities	19	3	—	3
Natural gas processing plants/trains	19	5	—	2
NGL pipelines	2	—	—	3
Natural gas pipelines	5	—	—	—
Oil pipelines	—	1	—	1

These assets and investments are located in the Rocky Mountains (Colorado, Utah and Wyoming), North-central Pennsylvania and Texas. During the second quarter of 2017, WES commenced operation of two produced-water disposal systems in West Texas, which are included within Gathering systems in the table above. Train VI, an additional processing plant at the DBM complex, is expected to commence operations during the fourth quarter of 2017.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Basis of presentation. The following table outlines WES’s ownership interests and the accounting method of consolidation used in WES’s consolidated financial statements:

	Percentage Interest
Equity investments (1)
Fort Union	14.81	%
White Cliffs	10	%
Rendezvous	22	%
Mont Belvieu JV	25	%
TEP	20	%
TEG	20	%
FRP	33.33	%
Proportionate consolidation (2)
Marcellus Interest systems	33.75	%
Newcastle system	50	%
Springfield system	50.1	%
Full consolidation
Chipeta (3)	75	%
DBJV system (4)	100	%

⁽¹⁾  Investments in non-controlled entities over which WES exercises significant influence are accounted for under the equity method. “Equity investment throughput” refers to WES’s share of average throughput for these investments.

⁽²⁾  WGP proportionately consolidates WES’s associated share of the assets, liabilities, revenues and expenses attributable to these assets.

⁽³⁾  The 25% interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interests in the consolidated financial statements, in addition to the noncontrolling interests noted below.

⁽⁴⁾  WES acquired an additional 50% interest in the DBJV system (the “Additional DBJV System Interest”) from a third party on March 17, 2017. See Note 2.

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The consolidated financial statements include the accounts of WGP and entities in which it holds a controlling financial interest, including WES and WES GP. All significant intercompany transactions have been eliminated.

Certain information and note disclosures commonly included in annual financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying consolidated financial statements and notes should be read in conjunction with WGP’s 2016 Form 10-K, as filed with the SEC on February 23, 2017. Management believes that the disclosures made are adequate to make the information not misleading.

The consolidated financial results of WES are included in WGP’s consolidated financial statements due to WGP’s 100% ownership interest in WES GP and WES GP’s control of WES. Throughout these notes to consolidated financial statements, and to the extent material, any differences between the consolidated financial results of WGP and WES are discussed separately. WGP has no independent operations or material assets other than its partnership interests in WES. WGP’s consolidated financial statements differ from those of WES primarily as a result of (i) the presentation of noncontrolling interest ownership (attributable to the limited partner interests in WES held by the public, other subsidiaries of Anadarko and private investors, see Note 4), (ii) the elimination of WES GP’s investment in WES with WES GP’s underlying capital account, (iii) the general and administrative expenses incurred by WGP, which are separate from, and in addition to, those incurred by WES, (iv) the inclusion of the impact of WGP equity balances and WGP distributions, and (v) WGP’s senior secured revolving credit facility (“WGP RCF”). See Note 9.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Variable interest entity.WES is a variable interest entity (“VIE”) because the partners in WES with equity at risk lack the power, through voting or similar rights, to direct the activities that most significantly impact WES’s economic performance. A reporting entity that concludes it has a variable interest in a VIE must evaluate whether it has a controlling financial interest in the VIE, such that it is the VIE’s primary beneficiary and should consolidate. WGP is the primary beneficiary of WES and therefore should consolidate because (i) WGP has the power to direct the activities of WES that most significantly affect its economic performance and (ii) WGP has the right to receive benefits or the obligation to absorb losses that could be potentially significant to WES. As noted above, WGP has no independent operations or material assets other than its partnership interests in WES. The assets of WES cannot be used by WGP for general partnership purposes. WES’s long-term debt is recourse to WES GP, which is wholly owned by WGP. In turn, WES GP is indemnified by wholly owned subsidiaries of Anadarko for any claims made against WES GP under the indentures governing WES’s outstanding notes or borrowings under WES’s senior unsecured revolving credit facility (“WES RCF”). WES’s sources of liquidity include cash and cash equivalents, cash flows generated from operations, interest income on its $260.0 million note receivable from Anadarko, available borrowing capacity under the WES RCF, and issuances of additional equity or debt securities. As further discussed in Note 2, WGP purchased WES common units in connection with WES’s financing of an acquisition from Anadarko in March 2016.

Noncontrolling interests. WGP’s noncontrolling interests in the consolidated financial statements consist of the following for all periods presented: (i) the 25% interest in Chipeta held by a third-party member, (ii) the publicly held limited partner interests in WES, (iii) the 2,011,380 WES common units issued by WES to other subsidiaries of Anadarko as part of the consideration paid for the acquisitions of the Non-Operated Marcellus Interest, the TEFR Interests and Springfield, and (iv) the WES Class C units issued by WES to a subsidiary of Anadarko as part of the funding for the acquisition of Delaware Basin Midstream, LLC (“DBM”). The WES Series A Preferred units issued to private investors as part of the funding of the Springfield acquisition were also noncontrolling interests in the consolidated financial statements until converted into WES common units in 2017. See Note 2 and Note 4.

When WES issues equity, the carrying amount of the noncontrolling interest reported by WGP is adjusted to reflect the noncontrolling ownership interest in WES. The resulting impact of such noncontrolling interest adjustment on WGP’s interest in WES is reflected as an adjustment to WGP’s partners’ capital.

Presentation of WES assets. The term “WES assets” includes both the assets indirectly owned and the interests accounted for under the equity method (see Note 7) by WGP through its partnership interests in WES as of September 30, 2017. Because WGP owns the entire interest in and controls WES GP, and WGP GP is owned and controlled by Anadarko, each of WES’s acquisitions of WES assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, WES assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by WES. Further, after an acquisition of WES assets from Anadarko, WES and WGP (by virtue of its consolidation of WES) may be required to recast their financial statements to include the activities of such WES assets from the date of common control.

For those periods requiring recast, the consolidated financial statements for periods prior to the acquisition of WES assets from Anadarko are prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if WES had owned the WES assets during the periods reported. Net income (loss) attributable to the WES assets acquired from Anadarko for periods prior to WES’s acquisition of the WES assets is not allocated to the limited partners.

Use of estimates. In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other methods considered reasonable. Changes in facts and circumstances or additional information may result in revised estimates and actual results may differ from these estimates. Effects on the business, financial condition and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements, and certain prior-period amounts have been reclassified to conform to the current-year presentation.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

Insurance recoveries. Involuntary conversions result from the loss of an asset because of some unforeseen event (e.g., destruction due to fire). Some of these events are insurable and result in property damage insurance recovery. Amounts that are received from insurance carriers are net of any deductibles related to the covered event. A receivable is recorded from insurance to the extent a loss is recognized from an involuntary conversion event and the likelihood of recovering such loss is deemed probable. To the extent that any insurance claim receivables are later judged not probable of recovery (e.g., due to new information), such amounts are expensed. A gain on involuntary conversion is recognized when the amount received from insurance exceeds the net book value of the retired asset(s). In addition, gains related to insurance recoveries are not recognized until all contingencies related to such proceeds have been resolved, that is, a cash payment is received from the insurance carrier or there is a binding settlement agreement with the carrier that clearly states that a payment will be made. To the extent that an asset is rebuilt, the associated expenditures are capitalized, as appropriate, in the consolidated balance sheets and presented as capital expenditures in the consolidated statements of cash flows. With respect to business interruption insurance claims, income is recognized only when cash proceeds are received from insurers, which are presented in the consolidated statements of operations as a component of Operating income (loss).

On December 3, 2015, there was an initial fire and secondary explosion at the processing facility within the DBM complex. The majority of the damage from the incident was to the liquid handling facilities and the amine treating units at the inlet of the complex. Train II (with capacity of 100 MMcf/d) sustained the most damage of the processing trains and returned to service in December 2016. Train III (with capacity of 200 MMcf/d) experienced minimal damage and returned to full service in May 2016. During the quarter ended March 31, 2017, a $5.7 million loss was recorded in Gain (loss) on divestiture and other, net in the consolidated statements of operations, related to a change in WES’s estimate of the amount that would be recovered under the property insurance claim based on further discussions with insurers. During the second quarter of 2017, WES reached a settlement with insurers and final proceeds were received. As of September 30, 2017, and December 31, 2016, the consolidated balance sheets include receivables of zero and $30.0 million, respectively, for the property insurance claim related to the incident at the DBM complex. During the nine months ended September 30, 2017, WES received $52.9 million in cash proceeds from insurers in final settlement of WES’s claims related to the incident at the DBM complex, including $29.9 million in proceeds from business interruption insurance claims and $23.0 million in proceeds from property insurance claims.

Recently adopted accounting standards. Accounting Standards Update (“ASU”) 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business assists in determining whether a transaction should be accounted for as an acquisition or disposal of assets or a business. This ASU provides a screen that when substantially all of the fair value of the gross assets acquired, or disposed of, are concentrated in a single identifiable asset, or a group of similar identifiable assets, the assets will not be considered a business. If the screen is not met, the assets must include an input and a substantive process that together significantly contribute to the ability to create an output to be considered a business. WGP’s adoption of this ASU on January 1, 2017, using a prospective approach, could have a material impact on future consolidated financial statements as goodwill will not be allocated to divestitures or recorded on acquisitions that are not considered businesses.

ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs and eliminates the exception for an intra-entity transfer of an asset other than inventory. WGP adopted this ASU on January 1, 2017, using a modified retrospective approach, with no impact to its consolidated financial statements.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

New accounting standards issued but not yet adopted. ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash requires an entity to explain the changes in the total of cash, cash equivalents, restricted cash, and restricted cash equivalents on the statement of cash flows and to provide a reconciliation of the totals in that statement to the related captions in the balance sheet when the cash, cash equivalents, restricted cash, and restricted cash equivalents are presented in more than one line item on the balance sheet. This ASU is effective for annual and interim periods beginning after December 15, 2017, and is required to be adopted using a retrospective approach, with early adoption permitted. WGP will adopt this ASU on January 1, 2018, and does not expect the adoption to have a material impact on its consolidated financial statements.

ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments provides clarification on how certain cash receipts and cash payments are presented and classified on the statement of cash flows. This ASU is effective for annual and interim periods beginning after December 15, 2017, and is required to be adopted using a retrospective approach if practicable, with early adoption permitted. WGP will adopt this ASU on January 1, 2018, and does not expect the adoption to have a material impact on its consolidated statement of cash flows.

ASU 2016-02, Leases (Topic 842) requires lessees to recognize a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months on the balance sheet. The provisions of ASU 2016-02 also modify the definition of a lease and outline the requirements for recognition, measurement, presentation, and disclosure of leasing arrangements by both lessees and lessors. WGP plans to elect certain practical expedients when implementing the new lease standard, which means WGP will not have to reassess the accounting for contracts that commenced prior to adoption. WGP has preliminarily determined WES’s portfolio of leased assets and is reviewing all related contracts to determine the impact that adoption will have on its consolidated financial statements. WGP is also evaluating the impact of this ASU on its systems, processes, and internal controls. WGP will complete its evaluation in 2018 and adopt this new standard on January 1, 2019, using a modified retrospective approach for all comparative periods presented.

ASU 2014-09, Revenue from Contracts with Customers (Topic 606) supersedes current revenue recognition requirements and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. Additional disclosures will be required to describe the nature, amount, timing, and uncertainty of revenue and cash flows from contracts with customers. WGP has completed an initial review of contracts in each of its revenue streams and is developing accounting policies to address the provisions of the ASU. While WGP does not currently expect net income to be materially impacted, it has concluded that WES is acting as an agent in the sale of certain volumes on behalf of WES’s customers based on the requirements of the new ASU. This conclusion will result in the reduction of Natural gas and natural gas liquids sales revenues and a corresponding reduction to cost of product expense related to WES’s contracts with these customers. In addition, WGP expects to recognize revenue for commodities received as noncash consideration in exchange for services provided and revenue and associated cost of product expense for the subsequent sale of those same commodities. This recognition will result in an increase to revenues for gathering and processing activities and cost of product expense with no impact on net income. WGP expects to recognize additional revenues for certain customer contributions related to capital cost recoveries that were previously accounted for as a reduction to capitalized property, plant and equipment. WGP also expects changes in the timing of recognizing revenue for certain fees due to the fee structure of certain contracts. WGP continues to evaluate the impact of these and other provisions of the ASU on its accounting policies, internal controls, and consolidated financial statements. Although WGP has not finalized the quantitative impact of the new standard, based on the assessment completed to date, WGP does not expect the adoption of this standard will have a material impact on its net income. WGP will complete its evaluation during the fourth quarter of 2017 and will adopt this new standard on January 1, 2018, using the modified retrospective method with a cumulative adjustment to equity and partners’ capital.

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Acquisitions and Divestitures

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Acquisitions and Divestitures

2.  ACQUISITIONS AND DIVESTITURES

The following table presents the acquisitions completed by WES during 2017 and 2016, and identifies the funding sources for such acquisitions:

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		WES Common Units Issued	WES Series A Preferred Units Issued
Springfield system (1)	03/14/2016	50.1	%	$	247,500	$	—	2,089,602	14,030,611
DBJV system (2)	03/17/2017	50	%	—		155,000		—	—

⁽¹⁾  WES acquired Springfield Pipeline LLC (“Springfield”) from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in an oil gathering system and a gas gathering system, such interest being referred to in this report as the “Springfield interest.” The Springfield oil and gas gathering systems (collectively, the “Springfield system”) are located in Dimmit, La Salle, Maverick and Webb Counties in South Texas. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units to private investors. See Note 4 for further information regarding WES’s Series A Preferred units. WGP financed the purchase of the WES common units by borrowing $25.0 million under the WGP RCF. See Note 9.

⁽²⁾  WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

Property exchange. On March 17, 2017, WES acquired the Additional DBJV System Interest from a third party in exchange for (a) WES’s 33.75% non-operated interest in two natural gas gathering systems located in northern Pennsylvania (the “Non-Operated Marcellus Interest”), commonly referred to as the Liberty and Rome systems, and (b) $155.0 million of cash consideration (collectively, the “Property Exchange”). WES previously held a 50% interest in, and operated, the DBJV system.

The Property Exchange is reflected as a nonmonetary transaction whereby the acquired Additional DBJV System Interest is recorded at the fair value of the divested Non-Operated Marcellus Interest plus the $155.0 million of cash consideration. The Property Exchange resulted in a net gain of $125.7 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations. Results of operations attributable to the Property Exchange were included in the consolidated statement of operations beginning on the acquisition date in the first quarter of 2017.

2.  ACQUISITIONS AND DIVESTITURES (CONTINUED)

DBJV acquisition - Deferred purchase price obligation - Anadarko.Prior to WES’s agreement with Anadarko to settle its deferred purchase price obligation early, the consideration that would have been paid by WES for the March 2015 acquisition of Delaware Basin JV Gathering LLC (“DBJV”) from Anadarko, consisted of a cash payment to Anadarko due on March 31, 2020. The cash payment would have been equal to (a) eight multiplied by the average of WES’s share in the Net Earnings (see definition below) of DBJV for the calendar years 2018 and 2019, less (b) WES’s share of all capital expenditures incurred for DBJV between March 1, 2015, and February 29, 2020. Net Earnings was defined as all revenues less cost of product, operating expenses and property taxes, in each case attributable to DBJV on an accrual basis. In May 2017, WES reached an agreement with Anadarko to settle this obligation whereby WES made a cash payment to Anadarko of $37.3 million, equal to the estimated net present value of the obligation at March 31, 2017.

The following table summarizes the financial statement impact of the Deferred purchase price obligation - Anadarko:

	Deferred purchase price obligation - Anadarko			Estimated future payment obligation (1)
Balance at December 31, 2016	$	41,440		$	56,455
Accretion expense (2)	71
Revision to Deferred purchase price obligation – Anadarko (3)	(4,165		)
Settlement of the Deferred purchase price obligation – Anadarko	(37,346		)
Balance at September 30, 2017	$	—		$	—

⁽¹⁾  Calculated using Level 3 inputs.

⁽²⁾  Accretion expense was recorded as a charge to Interest expense in the consolidated statements of operations.

⁽³⁾  Recorded as revisions within Common units in the consolidated balance sheet and consolidated statement of equity and partners’ capital.

Helper and Clawson systems divestiture. During the second quarter of 2017, the Helper and Clawson systems, located in Utah, were sold to a third party, resulting in a net gain on sale of $16.4 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations.

Hugoton system divestiture. During the fourth quarter of 2016, the Hugoton system, located in Southwest Kansas and Oklahoma, was sold to a third party, resulting in a net loss on sale of $12.0 million recorded as Gain (loss) on divestiture and other, net in the consolidated statements of operations. WES allocated $1.6 million in goodwill to this divestiture.

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Partnership Distributions

9 Months Ended

Sep. 30, 2017

Distributions Made to Members or Limited Partners [Abstract]

Partnership Distributions

3.  PARTNERSHIP DISTRIBUTIONS

WGP partnership distributions. WGP’s partnership agreement requires WGP to distribute all of its available cash (as defined in its partnership agreement) to WGP unitholders of record on the applicable record date within 55 days of the end of each quarter. The Board of Directors of WGP GP (the “Board of Directors”) declared the following cash distributions to WGP unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31	$	0.42375	$	92,767	May 2016
June 30	0.43375		94,958		August 2016
September 30	0.44750		97,968		November 2016
December 31	0.46250		101,254		February 2017
2017
March 31	$	0.49125	$	107,549	May 2017
June 30	0.52750		115,487		August 2017
September 30 (1)	0.53750		117,677		November 2017

⁽¹⁾  The Board of Directors declared a cash distribution to WGP unitholders for the third quarter of 2017 of $0.53750 per unit, or $117.7 million in aggregate. The cash distribution is payable on November 22, 2017, to WGP unitholders of record at the close of business on November 2, 2017.

WES partnership distributions. WES’s partnership agreement requires WES to distribute all of its available cash (as defined in WES’s partnership agreement) to WES unitholders of record on the applicable record date within 45 days of the end of each quarter. The Board of Directors of WES GP declared the following cash distributions to WES’s common and general partner unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31	$	0.815	$	158,905	May 2016
June 30	0.830		162,827		August 2016
September 30	0.845		166,742		November 2016
December 31	0.860		170,657		February 2017
2017
March 31	$	0.875	$	188,753	May 2017
June 30	0.890		207,491		August 2017
September 30 (1)	0.905		212,038		November 2017

⁽¹⁾  The Board of Directors of WES GP declared a cash distribution to WES unitholders for the third quarter of 2017 of $0.905 per unit, or $212.0 million in aggregate, including incentive distributions, but excluding distributions on WES Class C units (see WESClass C unit distributions below). The cash distribution is payable on November 13, 2017, to WES unitholders of record at the close of business on November 2, 2017.

3.  PARTNERSHIP DISTRIBUTIONS (CONTINUED)

WES’s available cash. The amount of available cash (as defined in WES’s partnership agreement) generally is all cash on hand at the end of the quarter, plus, at the discretion of WES GP, working capital borrowings made subsequent to the end of such quarter, less the amount of cash reserves established by WES GP to provide for the proper conduct of WES’s business, including reserves to fund future capital expenditures; to comply with applicable laws, debt instruments or other agreements; or to provide funds for distributions to WES unitholders and to WES GP for any one or more of the next four quarters. Working capital borrowings generally include borrowings made under a credit facility or similar financing arrangement. Working capital borrowings may only be those that, at the time of such borrowings, were intended to be repaid within 12 months. In all cases, working capital borrowings are used solely for working capital purposes or to fund distributions to partners.

WES Class C unit distributions. WES’s Class C units receive quarterly distributions at a rate equivalent to WES’s common units. The distributions are paid in the form of additional Class C units (“PIK Class C units”) until the scheduled conversion date on March 1, 2020 (unless earlier converted), and the Class C units are disregarded with respect to WES’s distributions of WES’s available cash until they are converted to WES common units. The number of additional PIK Class C units to be issued in connection with a distribution payable on the Class C units is determined by dividing the corresponding distribution attributable to the Class C units by the volume-weighted-average price of WES’s common units for the ten days immediately preceding the payment date for the WES common unit distribution, less a 6% discount. WES records the PIK Class C unit distributions at fair value at the time of issuance. This Level 2 fair value measurement uses WES’s unit price as a significant input in the determination of the fair value. See Note 4 for further discussion of the WES Class C units.

WES Series A Preferred unit distributions. As further described in Note 4, WES issued Series A Preferred units representing limited partner interests in WES to private investors in 2016. The Series A Preferred unitholders received quarterly distributions in cash equal to $0.68 per Series A Preferred unit, subject to certain adjustments. The following table summarizes the Series A Preferred unitholders’ cash distributions for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31 (1)	$	0.68	$	1,887	May 2016
June 30 (2)	0.68		14,082		August 2016
September 30	0.68		14,907		November 2016
December 31	0.68		14,908		February 2017
2017
March 31	$	0.68	$	7,453	May 2017

⁽¹⁾  Quarterly per unit distribution prorated for the 18-day period during which 14,030,611 WES Series A Preferred units were outstanding during the first quarter of 2016.

⁽²⁾  Full quarterly per unit distribution on 14,030,611 WES Series A Preferred units and quarterly per unit distribution prorated for the 77-day period during which 7,892,220 WES Series A Preferred units were outstanding during the second quarter of 2016.

On March 1, 2017, 50% of the outstanding WES Series A Preferred units converted into WES common units on a one-for-one basis, and on May 2, 2017, the remaining WES Series A Preferred units converted into WES common units on a one-for-one basis. Such converted WES common units were entitled to distributions made to WES common unitholders with respect to the quarter during which the applicable conversion occurred and did not include a prorated WES Series A Preferred unit distribution.

3.  PARTNERSHIP DISTRIBUTIONS (CONTINUED)

WES’s general partner interest and incentive distribution rights. As of September 30, 2017, WES GP was entitled to 1.5% of all quarterly distributions that WES makes prior to its liquidation and, as the holder of the incentive distribution rights (“IDRs”), was entitled to incentive distributions at the maximum distribution sharing percentage of 48.0% for all periods presented, after the minimum quarterly distribution and the target distribution levels had been achieved. The maximum distribution sharing percentage of 49.5% does not include any distributions that WES GP may receive on common units that it may acquire.

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Equity and Partners' Capital

9 Months Ended

Sep. 30, 2017

Partners' Capital Notes [Abstract]

Equity and Partners' Capital

4.  EQUITY AND PARTNERS’ CAPITAL

Holdings of WGP equity. WGP’s common units are listed on the New York Stock Exchange under the symbol “WGP.” As of September 30, 2017, Anadarko held 178,587,365 of WGP’s common units, representing an 81.6% limited partner interest in WGP, and, through its ownership of WGP GP, Anadarko indirectly held the entire non-economic general partner interest in WGP. The public held 40,345,776 WGP common units, representing an 18.4% limited partner interest in WGP.

In June 2016, Anadarko sold 12,500,000 of its WGP common units to the public through an underwritten offering. WGP did not receive any proceeds from, or incur any expense in, the public offering.

Tangible equity units. In June 2015, Anadarko completed the public issuance of 9,200,0007.50% tangible equity units (“TEUs”), including 1,200,000 TEUs pursuant to the full exercise of the underwriters’ over-allotment option, at a price to the public of $50.00 per TEU. Each TEU that Anadarko issued consists of (1) a prepaid equity purchase contract for WGP common units owned by Anadarko (subject to Anadarko’s right to elect to deliver shares of its common stock in lieu of such WGP common units) and (2) a senior amortizing note due June 7, 2018. WGP did not receive any proceeds from, or incur any expense in, the public offering.

Net income (loss) per common unit. For WGP, basic net income (loss) per common unit is calculated by dividing the limited partners’ interest in net income (loss) by the weighted-average number of common units outstanding during the period. Dilutive net income (loss) per common unit is calculated by dividing the limited partners’ interest in net income (loss) adjusted for distributions on the WES Series A Preferred units and a reallocation of the limited partners’ interest in net income (loss) assuming conversion of the WES Series A Preferred units into WES common units by the weighted-average number of WGP common units outstanding during the period. As of May 2, 2017, all WES Series A Preferred units were converted into WES common units on a one-for-one basis. The impact of the Series A Preferred units assuming conversion to WES common units would be anti-dilutive for all periods presented. Net income (loss) per common unit is calculated assuming that cash distributions are equal to the net income attributable to WGP. Net income (loss) attributable to the WES assets (as defined in Note 1) acquired from Anadarko for periods prior to WES’s acquisition of the WES assets is not allocated to the limited partners when calculating net income (loss) per common unit. Net income equal to the amount of available cash (as defined by WGP’s partnership agreement) is allocated to WGP common unitholders consistent with actual cash distributions.

Holdings of WES equity. As of September 30, 2017, WGP held 50,132,046 WES common units, representing a 29.8% limited partner interest in WES, and, through its ownership of WES GP, WGP indirectly held 2,583,068 general partner units, representing a 1.5% general partner interest in WES, and 100% of WES’s incentive distribution rights. As of September 30, 2017, (i) other subsidiaries of Anadarko collectively held 2,011,380 WES common units and 12,977,633 Class C units, representing an aggregate 9.0% limited partner interest in WES and (ii) the public held 100,458,679 WES common units, representing a 59.7% limited partner interest in WES, which are all reflected as noncontrolling interests within the consolidated financial statements of WGP (see Note 1 and Note 2).

4.  EQUITY AND PARTNERS’ CAPITAL (CONTINUED)

WES Class C units. In November 2014, WES issued 10,913,853 Class C units to Anadarko Midstream Holdings (“AMH”), pursuant to a Unit Purchase Agreement with Anadarko and AMH. The Class C units were issued to partially fund WES’s acquisition of DBM.

When issued, the WES Class C units were scheduled to convert into WES common units on a one-for-one basis on December 31, 2017. In February 2017, Anadarko elected to extend the conversion date of the WES Class C units to March 1, 2020. WES can elect to convert the Class C units earlier or Anadarko can extend the conversion date again.

WES Series A Preferred units. In 2016, WES issued 21,922,831 WES Series A Preferred units to private investors. Pursuant to an agreement between WES and the holders of the WES Series A Preferred units, 50% of the WES Series A Preferred units converted into WES common units on a one-for-one basis on March 1, 2017, and the remaining Series A Preferred units converted on a one-for-one basis on May 2, 2017. WES has an effective registration statement with the SEC relating to the public resale of the WES common units issued upon conversion of the WES Series A Preferred units.

WES interests. The following table summarizes WES’s common, Class C, Series A Preferred and general partner units issued during the nine months ended September 30, 2017:

	WES Common Units	WES Class C Units	WES Series A Preferred Units		WES General Partner Units	Total
Balance at December 31, 2016	130,671,970	12,358,123	21,922,831		2,583,068	167,535,992
PIK Class C units	—	619,510	—		—	619,510
Conversion of Series A Preferred units	21,922,831	—	(21,922,831	)	—	—
Long-Term Incentive Plan award vestings	7,304	—	—		—	7,304
Balance at September 30, 2017	152,602,105	12,977,633	—		2,583,068	168,162,806

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Transactions with Affiliates

9 Months Ended

Sep. 30, 2017

Related Party Fees and Other Arrangements, Limited Liability Company (LLC) or Limited Partnership (LP) [Abstract]

Transactions with Affiliates

5.  TRANSACTIONS WITH AFFILIATES

Affiliate transactions. Revenues from affiliates include amounts earned by WES from services provided to Anadarko as well as from the sale of residue and NGLs to Anadarko. In addition, WES purchases natural gas from an affiliate of Anadarko pursuant to gas purchase agreements. Operation and maintenance expense includes amounts accrued for or paid to affiliates for the operation of WES assets, whether in providing services to affiliates or to third parties, including field labor, measurement and analysis, and other disbursements. A portion of general and administrative expenses is paid by Anadarko, which results in affiliate transactions pursuant to the reimbursement provisions of the omnibus agreements of WES and WGP. Affiliate expenses do not bear a direct relationship to affiliate revenues, and third-party expenses do not bear a direct relationship to third-party revenues. See Note 2 for further information related to contributions of assets to WES by Anadarko.

Cash management. Anadarko operates a cash management system whereby excess cash from most of its subsidiaries’ separate bank accounts is generally swept to centralized accounts. Prior to the acquisition of WES assets, third-party sales and purchases related to such assets were received or paid in cash by Anadarko within its centralized cash management system. The outstanding affiliate balances were entirely settled through an adjustment to net investment by Anadarko in connection with the acquisition of WES assets. Subsequent to the acquisition of WES assets from Anadarko, transactions related to such assets are cash-settled directly with third parties and with Anadarko affiliates. Chipeta cash settles its transactions directly with third parties and Anadarko, as well as with the other subsidiaries of WES.

Note receivable - Anadarko. Concurrently with the closing of WES’s May 2008 initial public offering, WES loaned $260.0 million to Anadarko in exchange for a 30-year note bearing interest at a fixed annual rate of 6.50%, payable quarterly. The fair value of the note receivable from Anadarko was $313.2 million and $313.3 million at September 30, 2017, and December 31, 2016, respectively. The fair value of the note reflects consideration of credit risk and any premium or discount for the differential between the stated interest rate and quarter-end market interest rate, based on quoted market prices of similar debt instruments. Accordingly, the fair value of the note receivable from Anadarko is measured using Level 2 inputs.

WGP working capital facility.On November 1, 2012, WGP entered into a $30.0 million working capital facility (the “WGP WCF”) with Anadarko as the lender. The WGP WCF is available exclusively to fund WGP’s working capital borrowings. The WGP WCF will mature on November 1, 2017. See Note 9.

Commodity price swap agreements. WES has commodity price swap agreements with Anadarko to mitigate exposure to a majority of the commodity price risk inherent in its percent-of-proceeds and keep-whole contracts. Notional volumes for each of the commodity price swap agreements are not specifically defined. Instead, the commodity price swap agreements apply to the actual volume of natural gas, condensate and NGLs purchased and sold. The commodity price swap agreements do not satisfy the definition of a derivative financial instrument and, therefore, are not required to be measured at fair value.

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

The following table summarizes gains and losses upon settlement of WES’s commodity price swap agreements recognized in the consolidated statements of operations:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Gains (losses) on commodity price swap agreements related to sales: (1)
Natural gas sales	$	6,284		$	719		$	12,022		$	12,962
Natural gas liquids sales	(7,210		)	15,939			(9,680		)	56,489
Total	(926		)	16,658			2,342			69,451
Gains (losses) on commodity price swap agreements related to purchases (2)	(117		)	(9,248		)	(2,928		)	(45,032		)
Net gains (losses) on commodity price swap agreements	$	(1,043	)	$	7,410		$	(586	)	$	24,419

⁽¹⁾  Reported in affiliate Natural gas and natural gas liquids sales in the consolidated statements of operations in the period in which the related sale is recorded.

⁽²⁾  Reported in Cost of product in the consolidated statements of operations in the period in which the related purchase is recorded.

Revenues or costs attributable to volumes settled during 2016 and 2017 for the DJ Basin complex and 2017 for the MGR assets are recognized in the consolidated statements of operations at the applicable market price in the tables below. WES also records a capital contribution from Anadarko in its consolidated statement of equity and partners’ capital for the amount by which the swap price exceeds the applicable market price in the tables below. The commodity price swap agreement for the Hugoton system was in place until its divestiture in October 2016. For the nine months ended September 30, 2017, the capital contribution from Anadarko was $46.7 million. The tables below summarize the swap prices compared to the forward market prices:

	DJ Basin Complex
per barrel except natural gas	2016 - 2017 Swap Prices		2016 Market Prices (1)		2017 Market Prices (1)
Ethane	$	18.41	$	0.60	$	5.09
Propane	47.08		10.98		18.85
Isobutane	62.09		17.23		26.83
Normal butane	54.62		16.86		26.20
Natural gasoline	72.88		26.15		41.84
Condensate	76.47		34.65		45.40
Natural gas (per MMBtu)	5.96		2.11		3.05

⁽¹⁾  Represents the New York Mercantile Exchange (“NYMEX”) forward strip price as of December 8, 2015 and December 1, 2016, for the 2016 Market Prices and 2017 Market Prices, respectively, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

	MGR Assets
per barrel except natural gas	2016 - 2017 Swap Prices		2017 Market Prices (1)
Ethane	$	23.11	$	4.08
Propane	52.90		19.24
Isobutane	73.89		25.79
Normal butane	64.93		25.16
Natural gasoline	81.68		45.01
Condensate	81.68		53.55
Natural gas (per MMBtu)	4.87		3.05

⁽¹⁾  Represents the NYMEX forward strip price as of December 1, 2016, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

Gathering and processing agreements. WES has significant gathering and processing arrangements with affiliates of Anadarko on a majority of its systems. WES’s natural gas gathering, treating and transportation throughput (excluding equity investment throughput) attributable to production owned or controlled by Anadarko was 33% and 34% for the three and nine months ended September 30, 2017, respectively, and 37% and 38% for the three and nine months ended September 30, 2016, respectively. WES’s natural gas processing throughput (excluding equity investment throughput) attributable to production owned or controlled by Anadarko was 39% and 42% for the three and nine months ended September 30, 2017, respectively, and 51% and 55% for the three and nine months ended September 30, 2016, respectively. WES’s crude, NGL and produced water gathering, treating and transportation throughput (excluding equity investment throughput) attributable to production owned or controlled by Anadarko was 54% and 50% for the three and nine months ended September 30, 2017, respectively, and 67% and 64% for the three and nine months ended September 30, 2016, respectively.

Commodity purchase and sale agreements. WES sells a significant amount of its natural gas, condensate and NGLs to Anadarko Energy Services Company (“AESC”), Anadarko’s marketing affiliate. In addition, WES purchases natural gas, condensate and NGLs from AESC pursuant to purchase agreements. WES’s purchase and sale agreements with AESC are generally one-year contracts, subject to annual renewal.

Acquisitions from Anadarko. On March 14, 2016, WES acquired Springfield from Anadarko (seeNote 2).

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

WGP LTIP. WGP GP awards phantom units under the Western Gas Equity Partners, LP 2012 Long-Term Incentive Plan (“WGP LTIP”) to its independent directors and executive officers. The phantom units awarded to the independent directors vest one year from the grant date, while awards granted to executive officers are subject to graded vesting over a three-year service period. Compensation expense under the WGP LTIP is recognized over the vesting period and was $63,000 and $0.2 million for the three and nine months ended September 30, 2017, respectively, and $57,000 and $0.2 million for the three and nine months ended September 30, 2016, respectively.

WGP LTIP and Anadarko Incentive Plan. General and administrative expenses included $1.2 million and $3.2 million for the three and nine months ended September 30, 2017, respectively, and $1.4 million and $3.7 million for the three and nine months ended September 30, 2016, respectively, of equity-based compensation expense, allocated to WES by Anadarko, for awards granted to the executive officers of WES GP and other employees under the WGP LTIP and the Anadarko Petroleum Corporation 2012 Omnibus Incentive Compensation Plan (“Anadarko Incentive Plan”). Of this amount, $3.3 million is reflected as contributions to partners’ capital in the consolidated statement of equity and partners’ capital for the nine months ended September 30, 2017.

WES LTIP. WES GP awards phantom units under the Western Gas Partners, LP 2008 Long-Term Incentive Plan (“WES LTIP”) primarily to its independent directors, but also from time to time to its executive officers and Anadarko employees performing services for WES. The phantom units awarded to the independent directors vest one year from the grant date, while all other awards are subject to graded vesting over a three-year service period. Compensation expense is recognized over the vesting period and was $0.1 million for each of the three months ended September 30, 2017 and 2016, and $0.3 million for each of the nine months ended September 30, 2017 and 2016.

Equipment purchases and sales. The following table summarizes WES’s purchases from and sales to Anadarko of pipe and equipment:

	Nine Months Ended September 30,
	2017			2016			2017		2016
thousands	Purchases						Sales
Cash consideration	$	3,910		$	3,965		$	—	$	623
Net carrying value	(5,283		)	(3,366		)	—		(605		)
Partners’ capital adjustment	$	(1,373	)	$	599		$	—	$	18

Contributions in aid of construction costs from affiliates. On certain of WES’s capital projects, Anadarko is obligated to reimburse WES for all or a portion of project capital expenditures. The majority of such arrangements are associated with projects related to pipeline construction activities and production well tie-ins. The cash receipts resulting from such reimbursements are presented as “Contributions in aid of construction costs from affiliates” within the investing section of the consolidated statements of cash flows.

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

Summary of affiliate transactions. The following table summarizes material affiliate transactions. SeeNote 2 for discussion of affiliate acquisitions and related funding.

	Three Months Ended   September 30,					Nine Months Ended   September 30,
thousands	2017		2016			2017			2016
Revenues and other (1)	$	351,127	$	325,312		$	982,595		$	900,301
Equity income, net – affiliates (1)	21,519		20,294			62,708			56,801
Cost of product (1)	22,902		21,254			60,497			67,979
Operation and maintenance (2)	18,110		15,052			53,661			50,688
General and administrative (3)	10,414		9,655			29,637			28,179
Operating expenses	51,426		45,961			143,795			146,846
Interest income (4)	4,225		4,225			12,675			12,675
Interest expense (5)	—		(1,173		)	71			(12,097		)
Settlement of the Deferred purchase price obligation – Anadarko (6)	—		—			(37,346		)	—
Distributions to WGP unitholders (7)	94,205		77,462			264,533			235,587
Distributions to WES unitholders (8)	1,790		1,670			5,280			3,915
Above-market component of swap agreements with Anadarko	18,049		18,417			46,719			34,782

⁽¹⁾  Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

⁽²⁾  Represents expenses incurred on and subsequent to the date of the acquisition of WES assets, as well as expenses incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES.

⁽³⁾  Represents general and administrative expense incurred on and subsequent to the date of WES’s acquisition of WES assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of WES assets by WES. These amounts include equity-based compensation expense allocated to WES and WGP by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plan within this Note 5) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

⁽⁴⁾  Represents interest income recognized on the note receivable from Anadarko.

⁽⁵⁾  Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2andNote 9).

⁽⁶⁾  Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 2).

⁽⁷⁾  Represents distributions paid under WGP’s partnership agreement (see Note 3 and Note 4).

⁽⁸⁾  Represents distributions paid to other subsidiaries of Anadarko under WES’s partnership agreement (see Note 3 and Note 4).

Concentration of credit risk. Anadarko was the only customer from whom revenues exceeded 10% of consolidated revenues for all periods presented in the consolidated statements of operations.

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Property, Plant and Equipment

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

6.  PROPERTY, PLANT AND EQUIPMENT

A summary of the historical cost of WES’s property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2017		December 31, 2016
Land	n/a	$	4,271	$	4,012
Gathering systems and processing complexes	3 to 47 years	6,972,302		6,462,053
Pipelines and equipment	15 to 45 years	139,344		139,646
Assets under construction	n/a	434,432		226,626
Other	3 to 40 years	31,829		29,605
Total property, plant and equipment		7,582,178		6,861,942
Accumulated depreciation		2,074,464		1,812,010
Net property, plant and equipment		$	5,507,714	$	5,049,932

The cost of property classified as “Assets under construction” is excluded from capitalized costs being depreciated. These amounts represent property that is not yet suitable to be placed into productive service as of the respective balance sheet date.

Impairments. During the nine months ended September 30, 2017, WES recognized impairments of $170.1 million, including an impairment of $158.8 million at the Granger complex, which was impaired to its estimated fair value of $48.5 million using the income approach and Level 3 fair value inputs, due to a reduced throughput fee as a result of a producer’s bankruptcy. Also during the period, WES recognized additional impairments of $11.3 million, primarily related to (i) a $3.7 million impairment at the Granger straddle plant, which was impaired to its estimated salvage value of $0.6 million using the income approach and Level 3 fair value inputs, (ii) a $3.1 million impairment of the Fort Union equity investment (see Note 7), (iii) a $2.0 million impairment of an idle facility in northeast Wyoming, which was impaired to its estimated salvage value of $0.4 million using the market approach and Level 3 fair value inputs, and (iv) the cancellation of a pipeline project in West Texas.

During 2016, WES recognized impairments of $15.5 million, including an impairment of $6.1 million at the Newcastle system, which was impaired to its estimated fair value of $3.1 million using the income approach and Level 3 fair value inputs, due to a reduction in estimated future cash flows caused by the low commodity price environment. Also during 2016, WES recognized impairments of $9.4 million, primarily related to the cancellation of projects at the DJ Basin complex and Springfield and DBJV systems, and the abandonment of compressors at the MIGC system.

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Equity Investments

9 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Equity Investments

7.  EQUITY INVESTMENTS

The following table presents the activity of WES’s equity investments for the nine months ended September 30, 2017:

	Equity Investments
thousands	Fort Union			White Cliffs			Rendezvous			Mont Belvieu JV			TEG			TEP			FRP			Total
Balance at December 31, 2016	$	12,833		$	47,319		$	46,739		$	112,805		$	15,846		$	189,194		$	169,472		$	594,208
Investment earnings (loss), net of amortization	2,964			9,984			840			20,430			2,325			13,332			12,833			62,708
Impairment expense (1)	(3,110		)	—			—			—			—			—			—			(3,110		)
Contributions	—			277			—			—			—			107			—			384
Distributions	(3,359		)	(9,548		)	(2,296		)	(20,459		)	(2,167		)	(13,520		)	(12,964		)	(64,313		)
Distributions in excess of cumulative earnings (2)	(1,662		)	(2,325		)	(1,616		)	(2,316		)	—			(6,091		)	(2,245		)	(16,255		)
Balance at September 30, 2017	$	7,666		$	45,707		$	43,667		$	110,460		$	16,004		$	183,022		$	167,096		$	573,622

⁽¹⁾  Recorded in Impairments in the consolidated statements of operations.

⁽²⁾  Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

The investment balance in Fort Union at September 30, 2017, is $3.1 million less than WES’s underlying equity in Fort Union’s net assets due to an impairment loss recognized by WES in the second quarter of 2017 for its investment in Fort Union. This investment was impaired to its estimated fair value of $8.5 million, using the income approach and Level 3 fair value inputs.

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Components of Working Capital

9 Months Ended

Sep. 30, 2017

Components Of Working Capital [Abstract]

Components of Working Capital

8.  COMPONENTS OF WORKING CAPITAL

A summary of accounts receivable, net is as follows:

thousands	September 30, 2017		December 31, 2016
Trade receivables, net	$	192,394	$	192,606
Other receivables, net	43		30,415
Total accounts receivable, net	$	192,437	$	223,021

A summary of other current assets is as follows:

thousands	September 30, 2017		December 31, 2016
Natural gas liquids inventory	$	8,459	$	7,126
Imbalance receivables	2,103		3,483
Prepaid insurance	2,935		2,889
Total other current assets	$	13,497	$	13,498

A summary of accrued liabilities is as follows:

thousands	September 30, 2017		December 31, 2016
Accrued interest expense	$	45,624	$	39,834
Short-term asset retirement obligations	3,976		3,114
Short-term remediation and reclamation obligations	630		630
Income taxes payable	1,024		1,006
Other	6,445		606
Total accrued liabilities	$	57,699	$	45,190

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Debt and Interest Expense

9 Months Ended

Sep. 30, 2017

Debt Instruments [Abstract]

Debt and Interest Expense

9.  DEBT AND INTEREST EXPENSE

At September 30, 2017, WGP’s debt consisted of borrowings under the WGP RCF and WES’s 5.375% Senior Notes due 2021 (the “2021 Notes”), 4.000% Senior Notes due 2022 (the “2022 Notes”), 2.600% Senior Notes due 2018 (the “2018 Notes”), 5.450% Senior Notes due 2044 (the “2044 Notes”), 3.950% Senior Notes due 2025 (the “2025 Notes”), 4.650% Senior Notes due 2026 (the “2026 Notes”) and borrowings on the WES RCF.

The following table presents WES and WGP’s outstanding debt as of September 30, 2017, and December 31, 2016:

	September 30, 2017						December 31, 2016
thousands	Principal		Carrying Value		Fair Value(1)		Principal		Carrying Value		Fair Value (1)
WGP RCF	$	28,000	$	28,000	$	28,000	$	28,000	$	28,000	$	28,000
2021 Notes	500,000		495,541		536,712		500,000		494,734		536,252
2022 Notes	670,000		668,795		693,789		670,000		668,634		681,723
2018 Notes	350,000		349,558		351,770		350,000		349,188		351,531
2044 Notes	600,000		593,206		634,283		600,000		593,132		615,753
2025 Notes	500,000		491,653		503,322		500,000		490,971		492,499
2026 Notes	500,000		495,133		525,069		500,000		494,802		518,441
WES RCF	250,000		250,000		250,000		—		—		—
Total long-term debt	$	3,398,000	$	3,371,886	$	3,522,945	$	3,148,000	$	3,119,461	$	3,224,199

⁽¹⁾  Fair value is measured using the market approach and Level 2 inputs.

Debt activity. The following table presents WES and WGP’s debt activity for the nine months ended September 30, 2017:

thousands	Carrying Value
Balance at December 31, 2016	$	3,119,461
WES RCF borrowings	250,000
Other	2,425
Balance at September 30, 2017	$	3,371,886

WGP RCF. As of September 30, 2017, WGP had $28.0 million of outstanding borrowings and $222.0 million available for borrowing under the WGP RCF, which matures in March 2019. As of September 30, 2017 and 2016, the interest rate on the outstanding WGP RCF borrowings was 3.24% and 2.53%, respectively. The commitment fee rate was 0.30% at September 30, 2017 and 2016. At September 30, 2017, WGP was in compliance with all covenants under the WGP RCF.

WGP WCF. As of September 30, 2017, WGP had no outstanding borrowings and $30.0 million available for borrowing under the WGP WCF. The interest rate on the WGP WCF was 2.74% and 2.03% at September 30, 2017 and 2016, respectively. At September 30, 2017, WGP was in compliance with all covenants under the WGP WCF. The WGP WCF will mature on November 1, 2017, and WGP does not intend to renew this facility.

WES Senior Notes. The 2018 Notes, which are due in August 2018, were classified as long-term debt on the consolidated balance sheet at September 30, 2017, as WES has the ability and intent to refinance these obligations using long-term debt. At September 30, 2017, WES was in compliance with all covenants under the indentures governing its outstanding notes.

9.  DEBT AND INTEREST EXPENSE (CONTINUED)

WES RCF. As of September 30, 2017, WES had $250.0 million of outstanding WES RCF borrowings and $4.6 million in outstanding letters of credit, resulting in $945.4 million available for borrowing under the WES RCF, which matures in February 2020. As of September 30, 2017 and 2016, the interest rate on the outstanding WES RCF borrowings was 2.54% and 1.82%, respectively. The facility fee rate was 0.20% at September 30, 2017 and 2016. At September 30, 2017, WES was in compliance with all covenants under the WES RCF.

Interest expense. The following table summarizes the amounts included in interest expense:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Third parties
Long-term debt	$	(36,223	)	$	(31,795	)	$	(106,412	)	$	(88,123	)
Amortization of debt issuance costs and commitment fees	(2,009		)	(2,022		)	(5,955		)	(5,517		)
Capitalized interest	2,115			1,343			3,991			4,674
Total interest expense – third parties	(36,117		)	(32,474		)	(108,376		)	(88,966		)
Affiliates
Deferred purchase price obligation – Anadarko (1)	—			1,173			(71		)	12,097
Total interest expense – affiliates	—			1,173			(71		)	12,097
Interest expense	$	(36,117	)	$	(31,301	)	$	(108,447	)	$	(76,869	)

⁽¹⁾  See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

10.  COMMITMENTS AND CONTINGENCIES

Litigation and legal proceedings. From time to time, WGP, through its partnership interests in WES, is involved in legal, tax, regulatory and other proceedings in various forums regarding performance, contracts and other matters that arise in the ordinary course of business. Management is not aware of any such proceeding the final disposition of which could have a material adverse effect on the financial condition, results of operations or cash flows of WGP.

Other commitments. WES has short-term payment obligations, or commitments, related to its capital spending programs, as well as those of its unconsolidated affiliates. As of September 30, 2017, WES had unconditional payment obligations for services to be rendered or products to be delivered in connection with its capital projects of $143.3 million, the majority of which is expected to be paid in the next twelve months. These commitments relate primarily to expansion projects at the DBJV system and the DJ Basin and DBM complexes.

Lease commitments. Anadarko, on WES’s behalf, has entered into lease arrangements for corporate offices, shared field offices and a warehouse supporting WES’s operations, and equipment leases for which Anadarko charges WES rent. The leases for the corporate offices and shared field offices extend through 2028 and 2033, respectively, and the lease for the warehouse expired in February 2017.

WES’s rent expense associated with office, warehouse and equipment leases was $11.3 million and $30.7 million for the three and nine months ended September 30, 2017, respectively, and $8.9 million and $26.2 million for the three and nine months ended September 30, 2016, respectively.

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Description of Business and Basis of Presentation (Policies)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Consolidation policy

Basis of presentation. The following table outlines WES’s ownership interests and the accounting method of consolidation used in WES’s consolidated financial statements:

	Percentage Interest
Equity investments (1)
Fort Union	14.81	%
White Cliffs	10	%
Rendezvous	22	%
Mont Belvieu JV	25	%
TEP	20	%
TEG	20	%
FRP	33.33	%
Proportionate consolidation (2)
Marcellus Interest systems	33.75	%
Newcastle system	50	%
Springfield system	50.1	%
Full consolidation
Chipeta (3)	75	%
DBJV system (4)	100	%

⁽¹⁾  Investments in non-controlled entities over which WES exercises significant influence are accounted for under the equity method. “Equity investment throughput” refers to WES’s share of average throughput for these investments.

⁽²⁾  WGP proportionately consolidates WES’s associated share of the assets, liabilities, revenues and expenses attributable to these assets.

⁽³⁾  The 25% interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interests in the consolidated financial statements, in addition to the noncontrolling interests noted below.

⁽⁴⁾  WES acquired an additional 50% interest in the DBJV system (the “Additional DBJV System Interest”) from a third party on March 17, 2017. See Note 2.

The consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”). The consolidated financial statements include the accounts of WGP and entities in which it holds a controlling financial interest, including WES and WES GP. All significant intercompany transactions have been eliminated.

Certain information and note disclosures commonly included in annual financial statements have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). Accordingly, the accompanying consolidated financial statements and notes should be read in conjunction with WGP’s 2016 Form 10-K, as filed with the SEC on February 23, 2017. Management believes that the disclosures made are adequate to make the information not misleading.

The consolidated financial results of WES are included in WGP’s consolidated financial statements due to WGP’s 100% ownership interest in WES GP and WES GP’s control of WES. Throughout these notes to consolidated financial statements, and to the extent material, any differences between the consolidated financial results of WGP and WES are discussed separately. WGP has no independent operations or material assets other than its partnership interests in WES. WGP’s consolidated financial statements differ from those of WES primarily as a result of (i) the presentation of noncontrolling interest ownership (attributable to the limited partner interests in WES held by the public, other subsidiaries of Anadarko and private investors, see Note 4), (ii) the elimination of WES GP’s investment in WES with WES GP’s underlying capital account, (iii) the general and administrative expenses incurred by WGP, which are separate from, and in addition to, those incurred by WES, (iv) the inclusion of the impact of WGP equity balances and WGP distributions, and (v) WGP’s senior secured revolving credit facility (“WGP RCF”). See Note 9.

Variable interest entity policy

Variable interest entity.WES is a variable interest entity (“VIE”) because the partners in WES with equity at risk lack the power, through voting or similar rights, to direct the activities that most significantly impact WES’s economic performance. A reporting entity that concludes it has a variable interest in a VIE must evaluate whether it has a controlling financial interest in the VIE, such that it is the VIE’s primary beneficiary and should consolidate. WGP is the primary beneficiary of WES and therefore should consolidate because (i) WGP has the power to direct the activities of WES that most significantly affect its economic performance and (ii) WGP has the right to receive benefits or the obligation to absorb losses that could be potentially significant to WES. As noted above, WGP has no independent operations or material assets other than its partnership interests in WES. The assets of WES cannot be used by WGP for general partnership purposes. WES’s long-term debt is recourse to WES GP, which is wholly owned by WGP. In turn, WES GP is indemnified by wholly owned subsidiaries of Anadarko for any claims made against WES GP under the indentures governing WES’s outstanding notes or borrowings under WES’s senior unsecured revolving credit facility (“WES RCF”). WES’s sources of liquidity include cash and cash equivalents, cash flows generated from operations, interest income on its $260.0 million note receivable from Anadarko, available borrowing capacity under the WES RCF, and issuances of additional equity or debt securities. As further discussed in Note 2, WGP purchased WES common units in connection with WES’s financing of an acquisition from Anadarko in March 2016.

Business combinations policy

Noncontrolling interests. WGP’s noncontrolling interests in the consolidated financial statements consist of the following for all periods presented: (i) the 25% interest in Chipeta held by a third-party member, (ii) the publicly held limited partner interests in WES, (iii) the 2,011,380 WES common units issued by WES to other subsidiaries of Anadarko as part of the consideration paid for the acquisitions of the Non-Operated Marcellus Interest, the TEFR Interests and Springfield, and (iv) the WES Class C units issued by WES to a subsidiary of Anadarko as part of the funding for the acquisition of Delaware Basin Midstream, LLC (“DBM”). The WES Series A Preferred units issued to private investors as part of the funding of the Springfield acquisition were also noncontrolling interests in the consolidated financial statements until converted into WES common units in 2017. See Note 2 and Note 4.

When WES issues equity, the carrying amount of the noncontrolling interest reported by WGP is adjusted to reflect the noncontrolling ownership interest in WES. The resulting impact of such noncontrolling interest adjustment on WGP’s interest in WES is reflected as an adjustment to WGP’s partners’ capital.

Presentation of WES assets. The term “WES assets” includes both the assets indirectly owned and the interests accounted for under the equity method (see Note 7) by WGP through its partnership interests in WES as of September 30, 2017. Because WGP owns the entire interest in and controls WES GP, and WGP GP is owned and controlled by Anadarko, each of WES’s acquisitions of WES assets from Anadarko has been considered a transfer of net assets between entities under common control. As such, WES assets acquired from Anadarko were initially recorded at Anadarko’s historic carrying value, which did not correlate to the total acquisition price paid by WES. Further, after an acquisition of WES assets from Anadarko, WES and WGP (by virtue of its consolidation of WES) may be required to recast their financial statements to include the activities of such WES assets from the date of common control.

For those periods requiring recast, the consolidated financial statements for periods prior to the acquisition of WES assets from Anadarko are prepared from Anadarko’s historical cost-basis accounts and may not necessarily be indicative of the actual results of operations that would have occurred if WES had owned the WES assets during the periods reported. Net income (loss) attributable to the WES assets acquired from Anadarko for periods prior to WES’s acquisition of the WES assets is not allocated to the limited partners.

Use of estimates policy

Use of estimates. In preparing financial statements in accordance with GAAP, management makes informed judgments and estimates that affect the reported amounts of assets, liabilities, revenues and expenses. Management evaluates its estimates and related assumptions regularly, using historical experience and other methods considered reasonable. Changes in facts and circumstances or additional information may result in revised estimates and actual results may differ from these estimates. Effects on the business, financial condition and results of operations resulting from revisions to estimates are recognized when the facts that give rise to the revisions become known. The information furnished herein reflects all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the consolidated financial statements, and certain prior-period amounts have been reclassified to conform to the current-year presentation.

Property, plant and equipment policy

Insurance recoveries. Involuntary conversions result from the loss of an asset because of some unforeseen event (e.g., destruction due to fire). Some of these events are insurable and result in property damage insurance recovery. Amounts that are received from insurance carriers are net of any deductibles related to the covered event. A receivable is recorded from insurance to the extent a loss is recognized from an involuntary conversion event and the likelihood of recovering such loss is deemed probable. To the extent that any insurance claim receivables are later judged not probable of recovery (e.g., due to new information), such amounts are expensed. A gain on involuntary conversion is recognized when the amount received from insurance exceeds the net book value of the retired asset(s). In addition, gains related to insurance recoveries are not recognized until all contingencies related to such proceeds have been resolved, that is, a cash payment is received from the insurance carrier or there is a binding settlement agreement with the carrier that clearly states that a payment will be made. To the extent that an asset is rebuilt, the associated expenditures are capitalized, as appropriate, in the consolidated balance sheets and presented as capital expenditures in the consolidated statements of cash flows. With respect to business interruption insurance claims, income is recognized only when cash proceeds are received from insurers, which are presented in the consolidated statements of operations as a component of Operating income (loss).

On December 3, 2015, there was an initial fire and secondary explosion at the processing facility within the DBM complex. The majority of the damage from the incident was to the liquid handling facilities and the amine treating units at the inlet of the complex. Train II (with capacity of 100 MMcf/d) sustained the most damage of the processing trains and returned to service in December 2016. Train III (with capacity of 200 MMcf/d) experienced minimal damage and returned to full service in May 2016. During the quarter ended March 31, 2017, a $5.7 million loss was recorded in Gain (loss) on divestiture and other, net in the consolidated statements of operations, related to a change in WES’s estimate of the amount that would be recovered under the property insurance claim based on further discussions with insurers. During the second quarter of 2017, WES reached a settlement with insurers and final proceeds were received. As of September 30, 2017, and December 31, 2016, the consolidated balance sheets include receivables of zero and $30.0 million, respectively, for the property insurance claim related to the incident at the DBM complex. During the nine months ended September 30, 2017, WES received $52.9 million in cash proceeds from insurers in final settlement of WES’s claims related to the incident at the DBM complex, including $29.9 million in proceeds from business interruption insurance claims and $23.0 million in proceeds from property insurance claims.

New issued accounting standards policy

Recently adopted accounting standards. Accounting Standards Update (“ASU”) 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business assists in determining whether a transaction should be accounted for as an acquisition or disposal of assets or a business. This ASU provides a screen that when substantially all of the fair value of the gross assets acquired, or disposed of, are concentrated in a single identifiable asset, or a group of similar identifiable assets, the assets will not be considered a business. If the screen is not met, the assets must include an input and a substantive process that together significantly contribute to the ability to create an output to be considered a business. WGP’s adoption of this ASU on January 1, 2017, using a prospective approach, could have a material impact on future consolidated financial statements as goodwill will not be allocated to divestitures or recorded on acquisitions that are not considered businesses.

ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory requires an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs and eliminates the exception for an intra-entity transfer of an asset other than inventory. WGP adopted this ASU on January 1, 2017, using a modified retrospective approach, with no impact to its consolidated financial statements.

1.  DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (CONTINUED)

New accounting standards issued but not yet adopted. ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash requires an entity to explain the changes in the total of cash, cash equivalents, restricted cash, and restricted cash equivalents on the statement of cash flows and to provide a reconciliation of the totals in that statement to the related captions in the balance sheet when the cash, cash equivalents, restricted cash, and restricted cash equivalents are presented in more than one line item on the balance sheet. This ASU is effective for annual and interim periods beginning after December 15, 2017, and is required to be adopted using a retrospective approach, with early adoption permitted. WGP will adopt this ASU on January 1, 2018, and does not expect the adoption to have a material impact on its consolidated financial statements.

ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments provides clarification on how certain cash receipts and cash payments are presented and classified on the statement of cash flows. This ASU is effective for annual and interim periods beginning after December 15, 2017, and is required to be adopted using a retrospective approach if practicable, with early adoption permitted. WGP will adopt this ASU on January 1, 2018, and does not expect the adoption to have a material impact on its consolidated statement of cash flows.

ASU 2016-02, Leases (Topic 842) requires lessees to recognize a lease liability and a right-of-use asset for all leases, including operating leases, with a term greater than 12 months on the balance sheet. The provisions of ASU 2016-02 also modify the definition of a lease and outline the requirements for recognition, measurement, presentation, and disclosure of leasing arrangements by both lessees and lessors. WGP plans to elect certain practical expedients when implementing the new lease standard, which means WGP will not have to reassess the accounting for contracts that commenced prior to adoption. WGP has preliminarily determined WES’s portfolio of leased assets and is reviewing all related contracts to determine the impact that adoption will have on its consolidated financial statements. WGP is also evaluating the impact of this ASU on its systems, processes, and internal controls. WGP will complete its evaluation in 2018 and adopt this new standard on January 1, 2019, using a modified retrospective approach for all comparative periods presented.

ASU 2014-09, Revenue from Contracts with Customers (Topic 606) supersedes current revenue recognition requirements and requires an entity to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration the entity expects to be entitled to in exchange for those goods or services. Additional disclosures will be required to describe the nature, amount, timing, and uncertainty of revenue and cash flows from contracts with customers. WGP has completed an initial review of contracts in each of its revenue streams and is developing accounting policies to address the provisions of the ASU. While WGP does not currently expect net income to be materially impacted, it has concluded that WES is acting as an agent in the sale of certain volumes on behalf of WES’s customers based on the requirements of the new ASU. This conclusion will result in the reduction of Natural gas and natural gas liquids sales revenues and a corresponding reduction to cost of product expense related to WES’s contracts with these customers. In addition, WGP expects to recognize revenue for commodities received as noncash consideration in exchange for services provided and revenue and associated cost of product expense for the subsequent sale of those same commodities. This recognition will result in an increase to revenues for gathering and processing activities and cost of product expense with no impact on net income. WGP expects to recognize additional revenues for certain customer contributions related to capital cost recoveries that were previously accounted for as a reduction to capitalized property, plant and equipment. WGP also expects changes in the timing of recognizing revenue for certain fees due to the fee structure of certain contracts. WGP continues to evaluate the impact of these and other provisions of the ASU on its accounting policies, internal controls, and consolidated financial statements. Although WGP has not finalized the quantitative impact of the new standard, based on the assessment completed to date, WGP does not expect the adoption of this standard will have a material impact on its net income. WGP will complete its evaluation during the fourth quarter of 2017 and will adopt this new standard on January 1, 2018, using the modified retrospective method with a cumulative adjustment to equity and partners’ capital.

Net income (loss) per common unit policy

Net income (loss) per common unit. For WGP, basic net income (loss) per common unit is calculated by dividing the limited partners’ interest in net income (loss) by the weighted-average number of common units outstanding during the period. Dilutive net income (loss) per common unit is calculated by dividing the limited partners’ interest in net income (loss) adjusted for distributions on the WES Series A Preferred units and a reallocation of the limited partners’ interest in net income (loss) assuming conversion of the WES Series A Preferred units into WES common units by the weighted-average number of WGP common units outstanding during the period. As of May 2, 2017, all WES Series A Preferred units were converted into WES common units on a one-for-one basis. The impact of the Series A Preferred units assuming conversion to WES common units would be anti-dilutive for all periods presented. Net income (loss) per common unit is calculated assuming that cash distributions are equal to the net income attributable to WGP. Net income (loss) attributable to the WES assets (as defined in Note 1) acquired from Anadarko for periods prior to WES’s acquisition of the WES assets is not allocated to the limited partners when calculating net income (loss) per common unit. Net income equal to the amount of available cash (as defined by WGP’s partnership agreement) is allocated to WGP common unitholders consistent with actual cash distributions.

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Description of Business and Basis of Presentation (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Assets and Investments Table

As of September 30, 2017, WES’s assets and investments consisted of the following:

	Owned and Operated	Operated Interests	Non-Operated Interests	Equity Interests
Gathering systems	12	3	3	2
Treating facilities	19	3	—	3
Natural gas processing plants/trains	19	5	—	2
NGL pipelines	2	—	—	3
Natural gas pipelines	5	—	—	—
Oil pipelines	—	1	—	1

Ownership Interest and Method of Consolidation Table

The following table outlines WES’s ownership interests and the accounting method of consolidation used in WES’s consolidated financial statements:

	Percentage Interest
Equity investments (1)
Fort Union	14.81	%
White Cliffs	10	%
Rendezvous	22	%
Mont Belvieu JV	25	%
TEP	20	%
TEG	20	%
FRP	33.33	%
Proportionate consolidation (2)
Marcellus Interest systems	33.75	%
Newcastle system	50	%
Springfield system	50.1	%
Full consolidation
Chipeta (3)	75	%
DBJV system (4)	100	%

⁽¹⁾  Investments in non-controlled entities over which WES exercises significant influence are accounted for under the equity method. “Equity investment throughput” refers to WES’s share of average throughput for these investments.

⁽²⁾  WGP proportionately consolidates WES’s associated share of the assets, liabilities, revenues and expenses attributable to these assets.

⁽³⁾  The 25% interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interests in the consolidated financial statements, in addition to the noncontrolling interests noted below.

⁽⁴⁾  WES acquired an additional 50% interest in the DBJV system (the “Additional DBJV System Interest”) from a third party on March 17, 2017. See Note 2.

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Acquisitions and Divestitures (Tables)

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Acquisitions Table

The following table presents the acquisitions completed by WES during 2017 and 2016, and identifies the funding sources for such acquisitions:

thousands except unit and percent amounts	Acquisition Date	Percentage Acquired		Borrowings		Cash On Hand		WES Common Units Issued	WES Series A Preferred Units Issued
Springfield system (1)	03/14/2016	50.1	%	$	247,500	$	—	2,089,602	14,030,611
DBJV system (2)	03/17/2017	50	%	—		155,000		—	—

⁽¹⁾  WES acquired Springfield Pipeline LLC (“Springfield”) from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in an oil gathering system and a gas gathering system, such interest being referred to in this report as the “Springfield interest.” The Springfield oil and gas gathering systems (collectively, the “Springfield system”) are located in Dimmit, La Salle, Maverick and Webb Counties in South Texas. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units to private investors. See Note 4 for further information regarding WES’s Series A Preferred units. WGP financed the purchase of the WES common units by borrowing $25.0 million under the WGP RCF. See Note 9.

⁽²⁾  WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

Impact of Deferred Purchase Price Obligation - Anadarko Table

The following table summarizes the financial statement impact of the Deferred purchase price obligation - Anadarko:

	Deferred purchase price obligation - Anadarko			Estimated future payment obligation (1)
Balance at December 31, 2016	$	41,440		$	56,455
Accretion expense (2)	71
Revision to Deferred purchase price obligation – Anadarko (3)	(4,165		)
Settlement of the Deferred purchase price obligation – Anadarko	(37,346		)
Balance at September 30, 2017	$	—		$	—

⁽¹⁾  Calculated using Level 3 inputs.

⁽²⁾  Accretion expense was recorded as a charge to Interest expense in the consolidated statements of operations.

⁽³⁾  Recorded as revisions within Common units in the consolidated balance sheet and consolidated statement of equity and partners’ capital.

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Partnership Distributions (Tables)

9 Months Ended

Sep. 30, 2017

Distribution Made to Limited Partner [Line Items]

Cash Distributions Tables

The Board of Directors of WGP GP (the “Board of Directors”) declared the following cash distributions to WGP unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31	$	0.42375	$	92,767	May 2016
June 30	0.43375		94,958		August 2016
September 30	0.44750		97,968		November 2016
December 31	0.46250		101,254		February 2017
2017
March 31	$	0.49125	$	107,549	May 2017
June 30	0.52750		115,487		August 2017
September 30 (1)	0.53750		117,677		November 2017

⁽¹⁾  The Board of Directors declared a cash distribution to WGP unitholders for the third quarter of 2017 of $0.53750 per unit, or $117.7 million in aggregate. The cash distribution is payable on November 22, 2017, to WGP unitholders of record at the close of business on November 2, 2017.

Western Gas Partners, LP [Member]

Distribution Made to Limited Partner [Line Items]

Cash Distributions Tables

The Board of Directors of WES GP declared the following cash distributions to WES’s common and general partner unitholders for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31	$	0.815	$	158,905	May 2016
June 30	0.830		162,827		August 2016
September 30	0.845		166,742		November 2016
December 31	0.860		170,657		February 2017
2017
March 31	$	0.875	$	188,753	May 2017
June 30	0.890		207,491		August 2017
September 30 (1)	0.905		212,038		November 2017

⁽¹⁾  The Board of Directors of WES GP declared a cash distribution to WES unitholders for the third quarter of 2017 of $0.905 per unit, or $212.0 million in aggregate, including incentive distributions, but excluding distributions on WES Class C units (see WESClass C unit distributions below). The cash distribution is payable on November 13, 2017, to WES unitholders of record at the close of business on November 2, 2017.

Western Gas Partners, LP [Member] | Series A Preferred Units [Member]

Distribution Made to Limited Partner [Line Items]

Cash Distributions Tables

The following table summarizes the Series A Preferred unitholders’ cash distributions for the periods presented:

thousands except per-unit amounts Quarters Ended	Total Quarterly Distribution per Unit		Total Quarterly Cash Distribution		Date of Distribution
2016
March 31 (1)	$	0.68	$	1,887	May 2016
June 30 (2)	0.68		14,082		August 2016
September 30	0.68		14,907		November 2016
December 31	0.68		14,908		February 2017
2017
March 31	$	0.68	$	7,453	May 2017

⁽¹⁾  Quarterly per unit distribution prorated for the 18-day period during which 14,030,611 WES Series A Preferred units were outstanding during the first quarter of 2016.

⁽²⁾  Full quarterly per unit distribution on 14,030,611 WES Series A Preferred units and quarterly per unit distribution prorated for the 77-day period during which 7,892,220 WES Series A Preferred units were outstanding during the second quarter of 2016.

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Equity and Partners' Capital (Tables)

9 Months Ended

Sep. 30, 2017

Partners' Capital Notes [Abstract]

Partnership Interests Table

The following table summarizes WES’s common, Class C, Series A Preferred and general partner units issued during the nine months ended September 30, 2017:

	WES Common Units	WES Class C Units	WES Series A Preferred Units		WES General Partner Units	Total
Balance at December 31, 2016	130,671,970	12,358,123	21,922,831		2,583,068	167,535,992
PIK Class C units	—	619,510	—		—	619,510
Conversion of Series A Preferred units	21,922,831	—	(21,922,831	)	—	—
Long-Term Incentive Plan award vestings	7,304	—	—		—	7,304
Balance at September 30, 2017	152,602,105	12,977,633	—		2,583,068	168,162,806

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Transactions with Affiliates (Tables)

9 Months Ended

Sep. 30, 2017

Related Party Fees and Other Arrangements, Limited Liability Company (LLC) or Limited Partnership (LP) [Abstract]

Gains (Losses) on Commodity Price Swap Agreements Table

The following table summarizes gains and losses upon settlement of WES’s commodity price swap agreements recognized in the consolidated statements of operations:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Gains (losses) on commodity price swap agreements related to sales: (1)
Natural gas sales	$	6,284		$	719		$	12,022		$	12,962
Natural gas liquids sales	(7,210		)	15,939			(9,680		)	56,489
Total	(926		)	16,658			2,342			69,451
Gains (losses) on commodity price swap agreements related to purchases (2)	(117		)	(9,248		)	(2,928		)	(45,032		)
Net gains (losses) on commodity price swap agreements	$	(1,043	)	$	7,410		$	(586	)	$	24,419

⁽¹⁾  Reported in affiliate Natural gas and natural gas liquids sales in the consolidated statements of operations in the period in which the related sale is recorded.

⁽²⁾  Reported in Cost of product in the consolidated statements of operations in the period in which the related purchase is recorded.

Commodity Price Swap Agreements Tables

The tables below summarize the swap prices compared to the forward market prices:

	DJ Basin Complex
per barrel except natural gas	2016 - 2017 Swap Prices		2016 Market Prices (1)		2017 Market Prices (1)
Ethane	$	18.41	$	0.60	$	5.09
Propane	47.08		10.98		18.85
Isobutane	62.09		17.23		26.83
Normal butane	54.62		16.86		26.20
Natural gasoline	72.88		26.15		41.84
Condensate	76.47		34.65		45.40
Natural gas (per MMBtu)	5.96		2.11		3.05

⁽¹⁾  Represents the New York Mercantile Exchange (“NYMEX”) forward strip price as of December 8, 2015 and December 1, 2016, for the 2016 Market Prices and 2017 Market Prices, respectively, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

5.  TRANSACTIONS WITH AFFILIATES (CONTINUED)

	MGR Assets
per barrel except natural gas	2016 - 2017 Swap Prices		2017 Market Prices (1)
Ethane	$	23.11	$	4.08
Propane	52.90		19.24
Isobutane	73.89		25.79
Normal butane	64.93		25.16
Natural gasoline	81.68		45.01
Condensate	81.68		53.55
Natural gas (per MMBtu)	4.87		3.05

⁽¹⁾  Represents the NYMEX forward strip price as of December 1, 2016, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

Related Party Transactions Tables

The following table summarizes WES’s purchases from Anadarko of pipe and equipment:

	Nine Months Ended September 30,
	2017			2016			2017		2016
thousands	Purchases						Sales
Cash consideration	$	3,910		$	3,965		$	—	$	623
Net carrying value	(5,283		)	(3,366		)	—		(605		)
Partners’ capital adjustment	$	(1,373	)	$	599		$	—	$	18

The following table summarizes material affiliate transactions. SeeNote 2 for discussion of affiliate acquisitions and related funding.

	Three Months Ended   September 30,					Nine Months Ended   September 30,
thousands	2017		2016			2017			2016
Revenues and other (1)	$	351,127	$	325,312		$	982,595		$	900,301
Equity income, net – affiliates (1)	21,519		20,294			62,708			56,801
Cost of product (1)	22,902		21,254			60,497			67,979
Operation and maintenance (2)	18,110		15,052			53,661			50,688
General and administrative (3)	10,414		9,655			29,637			28,179
Operating expenses	51,426		45,961			143,795			146,846
Interest income (4)	4,225		4,225			12,675			12,675
Interest expense (5)	—		(1,173		)	71			(12,097		)
Settlement of the Deferred purchase price obligation – Anadarko (6)	—		—			(37,346		)	—
Distributions to WGP unitholders (7)	94,205		77,462			264,533			235,587
Distributions to WES unitholders (8)	1,790		1,670			5,280			3,915
Above-market component of swap agreements with Anadarko	18,049		18,417			46,719			34,782

⁽¹⁾  Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

⁽²⁾  Represents expenses incurred on and subsequent to the date of the acquisition of WES assets, as well as expenses incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES.

⁽³⁾  Represents general and administrative expense incurred on and subsequent to the date of WES’s acquisition of WES assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of WES assets by WES. These amounts include equity-based compensation expense allocated to WES and WGP by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plan within this Note 5) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

⁽⁴⁾  Represents interest income recognized on the note receivable from Anadarko.

⁽⁵⁾  Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2andNote 9).

⁽⁶⁾  Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 2).

⁽⁷⁾  Represents distributions paid under WGP’s partnership agreement (see Note 3 and Note 4).

⁽⁸⁾  Represents distributions paid to other subsidiaries of Anadarko under WES’s partnership agreement (see Note 3 and Note 4).

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Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment Table

A summary of the historical cost of WES’s property, plant and equipment is as follows:

thousands	Estimated Useful Life	September 30, 2017		December 31, 2016
Land	n/a	$	4,271	$	4,012
Gathering systems and processing complexes	3 to 47 years	6,972,302		6,462,053
Pipelines and equipment	15 to 45 years	139,344		139,646
Assets under construction	n/a	434,432		226,626
Other	3 to 40 years	31,829		29,605
Total property, plant and equipment		7,582,178		6,861,942
Accumulated depreciation		2,074,464		1,812,010
Net property, plant and equipment		$	5,507,714	$	5,049,932

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Equity Investments (Tables)

9 Months Ended

Sep. 30, 2017

Equity Method Investments and Joint Ventures [Abstract]

Equity Investments Table

The following table presents the activity of WES’s equity investments for the nine months ended September 30, 2017:

	Equity Investments
thousands	Fort Union			White Cliffs			Rendezvous			Mont Belvieu JV			TEG			TEP			FRP			Total
Balance at December 31, 2016	$	12,833		$	47,319		$	46,739		$	112,805		$	15,846		$	189,194		$	169,472		$	594,208
Investment earnings (loss), net of amortization	2,964			9,984			840			20,430			2,325			13,332			12,833			62,708
Impairment expense (1)	(3,110		)	—			—			—			—			—			—			(3,110		)
Contributions	—			277			—			—			—			107			—			384
Distributions	(3,359		)	(9,548		)	(2,296		)	(20,459		)	(2,167		)	(13,520		)	(12,964		)	(64,313		)
Distributions in excess of cumulative earnings (2)	(1,662		)	(2,325		)	(1,616		)	(2,316		)	—			(6,091		)	(2,245		)	(16,255		)
Balance at September 30, 2017	$	7,666		$	45,707		$	43,667		$	110,460		$	16,004		$	183,022		$	167,096		$	573,622

⁽¹⁾  Recorded in Impairments in the consolidated statements of operations.

⁽²⁾  Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

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Components of Working Capital (Tables)

9 Months Ended

Sep. 30, 2017

Components Of Working Capital [Abstract]

Accounts Receivable, Net Table

A summary of accounts receivable, net is as follows:

thousands	September 30, 2017		December 31, 2016
Trade receivables, net	$	192,394	$	192,606
Other receivables, net	43		30,415
Total accounts receivable, net	$	192,437	$	223,021

Other Current Assets Table

A summary of other current assets is as follows:

thousands	September 30, 2017		December 31, 2016
Natural gas liquids inventory	$	8,459	$	7,126
Imbalance receivables	2,103		3,483
Prepaid insurance	2,935		2,889
Total other current assets	$	13,497	$	13,498

Accrued Liabilities Table

A summary of accrued liabilities is as follows:

thousands	September 30, 2017		December 31, 2016
Accrued interest expense	$	45,624	$	39,834
Short-term asset retirement obligations	3,976		3,114
Short-term remediation and reclamation obligations	630		630
Income taxes payable	1,024		1,006
Other	6,445		606
Total accrued liabilities	$	57,699	$	45,190

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Debt and Interest Expense (Tables)

9 Months Ended

Sep. 30, 2017

Debt Instruments [Abstract]

Debt Outstanding and Debt Activity Tables

The following table presents WES and WGP’s outstanding debt as of September 30, 2017, and December 31, 2016:

	September 30, 2017						December 31, 2016
thousands	Principal		Carrying Value		Fair Value(1)		Principal		Carrying Value		Fair Value (1)
WGP RCF	$	28,000	$	28,000	$	28,000	$	28,000	$	28,000	$	28,000
2021 Notes	500,000		495,541		536,712		500,000		494,734		536,252
2022 Notes	670,000		668,795		693,789		670,000		668,634		681,723
2018 Notes	350,000		349,558		351,770		350,000		349,188		351,531
2044 Notes	600,000		593,206		634,283		600,000		593,132		615,753
2025 Notes	500,000		491,653		503,322		500,000		490,971		492,499
2026 Notes	500,000		495,133		525,069		500,000		494,802		518,441
WES RCF	250,000		250,000		250,000		—		—		—
Total long-term debt	$	3,398,000	$	3,371,886	$	3,522,945	$	3,148,000	$	3,119,461	$	3,224,199

⁽¹⁾  Fair value is measured using the market approach and Level 2 inputs.

Debt activity. The following table presents WES and WGP’s debt activity for the nine months ended September 30, 2017:

thousands	Carrying Value
Balance at December 31, 2016	$	3,119,461
WES RCF borrowings	250,000
Other	2,425
Balance at September 30, 2017	$	3,371,886

Interest Expense Table

The following table summarizes the amounts included in interest expense:

	Three Months Ended   September 30,						Nine Months Ended   September 30,
thousands	2017			2016			2017			2016
Third parties
Long-term debt	$	(36,223	)	$	(31,795	)	$	(106,412	)	$	(88,123	)
Amortization of debt issuance costs and commitment fees	(2,009		)	(2,022		)	(5,955		)	(5,517		)
Capitalized interest	2,115			1,343			3,991			4,674
Total interest expense – third parties	(36,117		)	(32,474		)	(108,376		)	(88,966		)
Affiliates
Deferred purchase price obligation – Anadarko (1)	—			1,173			(71		)	12,097
Total interest expense – affiliates	—			1,173			(71		)	12,097
Interest expense	$	(36,117	)	$	(31,301	)	$	(108,447	)	$	(76,869	)

⁽¹⁾  See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.

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Description of Business and Basis of Presentation - Assets and Investments Table (Details) - Western Gas Partners, LP [Member]	Sep. 30, 2017 unit
Owned and Operated [Member] | Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	12
Owned and Operated [Member] | Treating Facilities [Member]
Assets [Line Items]
Assets, number of units	19
Owned and Operated [Member] | Natural Gas Processing Plants/Trains [Member]
Assets [Line Items]
Assets, number of units	19
Owned and Operated [Member] | Natural Gas Liquids Pipelines [Member]
Assets [Line Items]
Assets, number of units	2
Owned and Operated [Member] | Natural Gas Pipelines [Member]
Assets [Line Items]
Assets, number of units	5
Operated Interests [Member] | Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	3
Operated Interests [Member] | Treating Facilities [Member]
Assets [Line Items]
Assets, number of units	3
Operated Interests [Member] | Natural Gas Processing Plants/Trains [Member]
Assets [Line Items]
Assets, number of units	5
Operated Interests [Member] | Oil Pipelines [Member]
Assets [Line Items]
Assets, number of units	1
Non-Operated Interests [Member] | Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	3
Equity Interests [Member] | Gathering Systems [Member]
Assets [Line Items]
Assets, number of units	2
Equity Interests [Member] | Treating Facilities [Member]
Assets [Line Items]
Assets, number of units	3
Equity Interests [Member] | Natural Gas Processing Plants/Trains [Member]
Assets [Line Items]
Assets, number of units	2
Equity Interests [Member] | Natural Gas Liquids Pipelines [Member]
Assets [Line Items]
Assets, number of units	3
Equity Interests [Member] | Oil Pipelines [Member]
Assets [Line Items]
Assets, number of units	1

XML

Description of Business and Basis of Presentation - Ownership Interest and Method of Consolidation Table (Details)			9 Months Ended
		Mar. 17, 2017	Sep. 30, 2017
Chipeta [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest by noncontrolling interest owner			25.00%
Western Gas Partners, LP [Member] | DBJV System [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership percentage acquired	[1]	50.00%
Western Gas Partners, LP [Member] | Equity Investments [Member] | Fort Union [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		14.81%
Western Gas Partners, LP [Member] | Equity Investments [Member] | White Cliffs [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		10.00%
Western Gas Partners, LP [Member] | Equity Investments [Member] | Rendezvous [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		22.00%
Western Gas Partners, LP [Member] | Equity Investments [Member] | Mont Belvieu JV [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		25.00%
Western Gas Partners, LP [Member] | Equity Investments [Member] | Texas Express Pipeline LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		20.00%
Western Gas Partners, LP [Member] | Equity Investments [Member] | Texas Express Gathering LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		20.00%
Western Gas Partners, LP [Member] | Equity Investments [Member] | Front Range Pipeline LLC [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[2]		33.33%
Western Gas Partners, LP [Member] | Proportionate Consolidation [Member] | Marcellus Interest Systems [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[3]		33.75%
Western Gas Partners, LP [Member] | Proportionate Consolidation [Member] | Newcastle System [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[3]		50.00%
Western Gas Partners, LP [Member] | Proportionate Consolidation [Member] | Springfield System [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[3]		50.10%
Western Gas Partners, LP [Member] | Full Consolidation [Member] | Chipeta [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[4]		75.00%
Western Gas Partners, LP [Member] | Full Consolidation [Member] | DBJV System [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage ownership interest	[5]		100.00%

[1] WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

[2] Investments in non-controlled entities over which WES exercises significant influence are accounted for under the equity method. “Equity investment throughput” refers to WES’s share of average throughput for these investments.

[3] WGP proportionately consolidates WES’s associated share of the assets, liabilities, revenues and expenses attributable to these assets.

[4] The 25% interest in Chipeta Processing LLC (“Chipeta”) held by a third-party member is reflected within noncontrolling interests in the consolidated financial statements, in addition to the noncontrolling interests noted below.

[5] WES acquired an additional 50% interest in the DBJV system (the “Additional DBJV System Interest”) from a third party on March 17, 2017. See Note 2.

XML

Description of Business and Basis of Presentation - Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Mcf / d shares	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	May 31, 2008 USD ($)
Note receivable - Anadarko	$ 260,000,000			$ 260,000,000		$ 260,000,000
Loss on divestiture and other, net	$ (72,000)		$ 6,230,000	(135,017,000)	$ 8,769,000
Proceeds from property insurance claims				$ 22,977,000	$ 18,398,000
Chipeta [Member]
Ownership interest by noncontrolling interest owner	25.00%			25.00%
Western Gas Equity Partners, LP [Member] | Western Gas Partners, LP [Member] | General Partner [Member]
Percentage ownership interest				100.00%
Western Gas Partners, LP [Member] | Delaware Basin Midstream Complex [Member]
Loss on divestiture and other, net		$ 5,700,000
Property insurance claim receivable	$ 0			$ 0		$ 30,000,000
Proceeds from insurance claims, total				52,900,000
Proceeds from business interruption insurance claims				29,882,000
Proceeds from property insurance claims				$ 22,977,000
Western Gas Partners, LP [Member] | Delaware Basin Midstream Complex [Member] | Train II [Member]
Plant capacity | Mcf / d				100,000
Western Gas Partners, LP [Member] | Delaware Basin Midstream Complex [Member] | Train III [Member]
Plant capacity | Mcf / d				200,000
Western Gas Partners, LP [Member] | Affiliates [Member]
Note receivable - Anadarko	$ 260,000,000			$ 260,000,000			$ 260,000,000
Western Gas Partners, LP [Member] | Other Subsidiaries Of Anadarko [Member]
WES common units issued | shares				2,011,380

XML

Acquisitions and Divestitures - Acquisitions Table (Details) - USD ($) $ in Thousands				9 Months Ended
		Mar. 17, 2017	Mar. 14, 2016	Sep. 30, 2017
Revolving Credit Facility [Member] | WGP RCF [Member]
Business Acquisition [Line Items]
Borrowings - revolving credit facility			$ 25,000
Western Gas Partners, LP [Member]
Business Acquisition [Line Items]
WES units issued				619,510
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member] | WES RCF [Member]
Business Acquisition [Line Items]
Borrowings - revolving credit facility				$ 250,000
Western Gas Partners, LP [Member] | Springfield [Member]
Business Acquisition [Line Items]
Ownership percentage acquired	[1]		50.10%
Acquisition price			$ 750,000
Cash payment for acquisition			$ 712,500
Western Gas Partners, LP [Member] | Springfield [Member] | Common Units [Member]
Business Acquisition [Line Items]
WES units issued	[1]		2,089,602
Western Gas Partners, LP [Member] | Springfield [Member] | Common Units [Member] | Anadarko [Member]
Business Acquisition [Line Items]
WES units issued			1,253,761
Western Gas Partners, LP [Member] | Springfield [Member] | Common Units [Member] | Western Gas Equity Partners, LP [Member]
Business Acquisition [Line Items]
WES units issued			835,841
Western Gas Partners, LP [Member] | Springfield [Member] | Series A Preferred Units [Member]
Business Acquisition [Line Items]
WES units issued	[1]		14,030,611
Western Gas Partners, LP [Member] | Springfield [Member] | Revolving Credit Facility [Member] | WES RCF [Member]
Business Acquisition [Line Items]
Borrowings - revolving credit facility	[1]		$ 247,500
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member]
Business Acquisition [Line Items]
Ownership percentage acquired	[2]	50.00%
Cash on hand	[2]	$ 155,000

[1] WES acquired Springfield Pipeline LLC (“Springfield”) from Anadarko for $750.0 million, consisting of $712.5 million in cash and the issuance of 1,253,761 of WES common units. Springfield owns a 50.1% interest in an oil gathering system and a gas gathering system, such interest being referred to in this report as the “Springfield interest.” The Springfield oil and gas gathering systems (collectively, the “Springfield system”) are located in Dimmit, La Salle, Maverick and Webb Counties in South Texas. WES financed the cash portion of the acquisition through: (i) borrowings of $247.5 million on the WES RCF, (ii) the issuance of 835,841 of WES common units to WGP and (iii) the issuance of WES Series A Preferred units to private investors. See Note 4 for further information regarding WES’s Series A Preferred units. WGP financed the purchase of the WES common units by borrowing $25.0 million under the WGP RCF. See Note 9.

[2] WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

XML

Acquisitions and Divestitures - Impact of the Deferred Purchase Price Obligation - Anadarko Table (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Deferred purchase price obligation - Anadarko, present value	[1]	$ 0		$ 0		$ 41,440
Affiliates [Member]
Property, Plant and Equipment [Line Items]
Settlement of the Deferred purchase price obligation - Anadarko	[2]			(37,346)	$ 0
Affiliates [Member] | Deferred Purchase Price Obligation - Anadarko [Member]
Property, Plant and Equipment [Line Items]
Accretion expense	[3]	0	$ (1,173)	71	(12,097)
Settlement of the Deferred purchase price obligation - Anadarko	[4]	0	$ 0	(37,346)	$ 0
Western Gas Partners, LP [Member] | Affiliates [Member] | Delaware Basin JV Gathering LLC [Member] | Deferred Purchase Price Obligation - Anadarko [Member]
Property, Plant and Equipment [Line Items]
Deferred purchase price obligation - Anadarko, present value		0		0		41,440
Accretion expense	[5]			71
Revision to Deferred purchase price obligation – Anadarko	[6]			(4,165)
Settlement of the Deferred purchase price obligation - Anadarko				(37,346)
Deferred purchase price obligation - Anadarko, future value	[7]	$ 0		$ 0		$ 56,455

[1] See Note 2.

[2] See Note 2.

[3] See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.

[4] Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 2).

[5] Accretion expense was recorded as a charge to Interest expense in the consolidated statements of operations.

[6] Recorded as revisions within Common units in the consolidated balance sheet and consolidated statement of equity and partners’ capital.

[7] Calculated using Level 3 inputs.

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Acquisitions and Divestitures - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended			9 Months Ended		12 Months Ended
		Mar. 17, 2017	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Affiliates [Member]
Property, Plant and Equipment [Line Items]
Cash payment						$ 3,910	$ 716,465
Settlement of the Deferred purchase price obligation - Anadarko	[1]					37,346	0
Deferred Purchase Price Obligation - Anadarko [Member] | Affiliates [Member]
Property, Plant and Equipment [Line Items]
Settlement of the Deferred purchase price obligation - Anadarko	[2]		$ 0		$ 0	37,346	$ 0
Western Gas Partners, LP [Member] | Helper and Clawson Systems [Member]
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets						16,400
Western Gas Partners, LP [Member] | Hugoton System [Member]
Property, Plant and Equipment [Line Items]
Gain (loss) on sale of assets								$ (12,000)
Goodwill allocated to divestiture								$ 1,600
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member]
Property, Plant and Equipment [Line Items]
Percentage ownership interest		50.00%
Cash payment	[3]	$ 155,000
Net gain from property exchange				$ 125,700
Western Gas Partners, LP [Member] | Delaware Basin JV Gathering LLC [Member] | Deferred Purchase Price Obligation - Anadarko [Member] | Affiliates [Member]
Property, Plant and Equipment [Line Items]
Settlement of the Deferred purchase price obligation - Anadarko						$ 37,346
Western Gas Partners, LP [Member] | Non-Operated Marcellus Interest [Member]
Property, Plant and Equipment [Line Items]
Percentage ownership interest		33.75%

[1] See Note 2.

[2] Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 2).

[3] WES acquired the Additional DBJV System Interest from a third party. See Property exchange below.

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Partnership Distributions - Cash Distributions Tables (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Sep. 30, 2017		Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Distribution Made to Limited Partner [Line Items]
Total quarterly distribution per unit	$ 0.53750	[1]	$ 0.52750	$ 0.49125	$ 0.46250	$ 0.44750	$ 0.43375	$ 0.42375
Total quarterly cash distribution	$ 117,677	[1]	$ 115,487	$ 107,549	$ 101,254	$ 97,968	$ 94,958	$ 92,767
Western Gas Partners, LP [Member]
Distribution Made to Limited Partner [Line Items]
Total quarterly distribution per unit	$ 0.905	[2]	$ 0.890	$ 0.875	$ 0.860	$ 0.845	$ 0.830	$ 0.815
Total quarterly cash distribution	$ 212,038	[2]	$ 207,491	$ 188,753	$ 170,657	$ 166,742	$ 162,827	$ 158,905

[1] The Board of Directors declared a cash distribution to WGP unitholders for the third quarter of 2017 of $0.53750 per unit, or $117.7 million in aggregate. The cash distribution is payable on November 22, 2017, to WGP unitholders of record at the close of business on November 2, 2017.

[2] The Board of Directors of WES GP declared a cash distribution to WES unitholders for the third quarter of 2017 of $0.905 per unit, or $212.0 million in aggregate, including incentive distributions, but excluding distributions on WES Class C units (see WES Class C unit distributions below). The cash distribution is payable on November 13, 2017, to WES unitholders of record at the close of business on November 2, 2017.

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Partnership Distributions - Series A Preferred Unit Distributions Table (Details) - Western Gas Partners, LP [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended							9 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016		Sep. 30, 2017	Dec. 31, 2016
Distribution Made to Limited Partner [Line Items]
Units issued								619,510
Series A Preferred Units [Member]
Distribution Made to Limited Partner [Line Items]
Series A Preferred units quarterly distribution per unit	$ 0.68	$ 0.68	$ 0.68	$ 0.68	[1]	$ 0.68	[2]
Series A Preferred units quarterly cash distribution	$ 7,453	$ 14,908	$ 14,907	$ 14,082	[1]	$ 1,887	[2]
Number of days in prorated period				77 days		18 days
Series A Preferred Units [Member] | Private Investor [Member]
Distribution Made to Limited Partner [Line Items]
Units issued						14,030,611			21,922,831
Series A Preferred Units [Member] | Private Investor [Member] | Over-Allotment Option [Member]
Distribution Made to Limited Partner [Line Items]
Units issued				7,892,220

[1] Full quarterly per unit distribution on 14,030,611 WES Series A Preferred units and quarterly per unit distribution prorated for the 77-day period during which 7,892,220 WES Series A Preferred units were outstanding during the second quarter of 2016.

[2] Quarterly per unit distribution prorated for the 18-day period during which 14,030,611 WES Series A Preferred units were outstanding during the first quarter of 2016.

XML

Partnership Distributions - Additional Information (Details) - $ / shares			3 Months Ended							9 Months Ended
	May 02, 2017	Mar. 01, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	[1]	Mar. 31, 2016	[2]	Sep. 30, 2017
Distribution Made to Limited Partner [Line Items]
Partnership agreement day requirement of distribution of available cash										55 days
Western Gas Partners, LP [Member]
Distribution Made to Limited Partner [Line Items]
Partnership agreement day requirement of distribution of available cash										45 days
Incentive distributions percentage										48.00%
Western Gas Partners, LP [Member] | Minimum [Member]
Distribution Made to Limited Partner [Line Items]
Distribution sharing percentage										1.50%
Western Gas Partners, LP [Member] | Maximum [Member]
Distribution Made to Limited Partner [Line Items]
Distribution sharing percentage										49.50%
Western Gas Partners, LP [Member] | Class C Units [Member]
Distribution Made to Limited Partner [Line Items]
Discount rate percentage										6.00%
Western Gas Partners, LP [Member] | Series A Preferred Units [Member]
Distribution Made to Limited Partner [Line Items]
Series A Preferred units quarterly distribution per unit			$ 0.68	$ 0.68	$ 0.68	$ 0.68		$ 0.68
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Series A Preferred Units March 2017 Conversion [Member]
Distribution Made to Limited Partner [Line Items]
Series A Preferred units, percentage converted		50.00%
Series A Preferred units, common units issued upon conversion		1
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Series A Preferred Units May 2017 Conversion [Member]
Distribution Made to Limited Partner [Line Items]
Series A Preferred units, percentage converted	50.00%
Series A Preferred units, common units issued upon conversion	1

[1] Full quarterly per unit distribution on 14,030,611 WES Series A Preferred units and quarterly per unit distribution prorated for the 77-day period during which 7,892,220 WES Series A Preferred units were outstanding during the second quarter of 2016.

[2] Quarterly per unit distribution prorated for the 18-day period during which 14,030,611 WES Series A Preferred units were outstanding during the first quarter of 2016.

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Equity and Partners' Capital - Partnership Interests Table (Details) - Western Gas Partners, LP [Member]	9 Months Ended
	Sep. 30, 2017 shares
Capital Unit [Line Items]
Balance	167,535,992
Units issued	619,510
Conversion of Series A Preferred units	0
Long-Term Incentive Plan award vestings	7,304
Balance	168,162,806
Common Units [Member]
Capital Unit [Line Items]
Balance	130,671,970
Conversion of Series A Preferred units	21,922,831
Long-Term Incentive Plan award vestings	7,304
Balance	152,602,105
Class C Units [Member]
Capital Unit [Line Items]
Balance	12,358,123
Units issued	619,510
Balance	12,977,633
Series A Preferred Units [Member]
Capital Unit [Line Items]
Balance	21,922,831
Conversion of Series A Preferred units	(21,922,831)
Balance	0
General Partner [Member]
Capital Unit [Line Items]
Balance	2,583,068
Balance	2,583,068

XML

Equity and Partners' Capital - Additional Information (Details)			1 Months Ended			3 Months Ended		9 Months Ended	12 Months Ended
	May 02, 2017 shares	Mar. 01, 2017 shares	Jun. 30, 2016 shares	Jun. 30, 2015 $ / unit shares	Nov. 30, 2014 shares	Jun. 30, 2016 shares	Mar. 31, 2016 shares	Sep. 30, 2017 shares	Dec. 31, 2016 shares
Schedule of Investments [Line Items]
Limited partner units owned								218,933,141	218,928,570
7.50% Tangible Equity Units [Member] | Anadarko [Member]
Schedule of Investments [Line Items]
Tangible equity units issued				9,200,000
Tangible equity unit rate				7.50%
Stated amount per tangible equity unit | $ / unit				50.00
Debt instrument, maturity date				Jun. 07, 2018
7.50% Tangible Equity Units [Member] | Anadarko [Member] | Over-Allotment Option [Member]
Schedule of Investments [Line Items]
Tangible equity units issued				1,200,000
Common Units [Member] | Anadarko [Member]
Schedule of Investments [Line Items]
Common units issued			12,500,000
Public [Member] | Western Gas Equity Partners, LP [Member]
Schedule of Investments [Line Items]
Limited partner units owned								40,345,776
Ownership interest								18.40%
Public [Member] | Western Gas Partners, LP [Member] | Common Units [Member]
Schedule of Investments [Line Items]
Limited partner units owned								100,458,679
Ownership interest								59.70%
Anadarko [Member] | Western Gas Equity Partners, LP [Member]
Schedule of Investments [Line Items]
Limited partner units owned								178,587,365
Ownership interest								81.60%
Other Subsidiaries Of Anadarko [Member] | Western Gas Partners, LP [Member] | Common Units [Member]
Schedule of Investments [Line Items]
Limited partner units owned								2,011,380
Other Subsidiaries Of Anadarko [Member] | Western Gas Partners, LP [Member] | Class C Units [Member]
Schedule of Investments [Line Items]
Limited partner units owned								12,977,633
Other Subsidiaries Of Anadarko [Member] | Western Gas Partners, LP [Member] | Common and Class C Units [Member]
Schedule of Investments [Line Items]
Ownership interest								9.00%
Western Gas Equity Partners, LP [Member] | Western Gas Partners, LP [Member]
Schedule of Investments [Line Items]
General partner units owned								2,583,068
General partner's interest								1.50%
Western Gas Equity Partners, LP [Member] | Western Gas Partners, LP [Member] | Common Units [Member]
Schedule of Investments [Line Items]
Limited partner units owned								50,132,046
Ownership interest								29.80%
Western Gas Equity Partners, LP [Member] | Western Gas Partners, LP [Member] | Incentive Distribution Rights [Member]
Schedule of Investments [Line Items]
General partner's interest								100.00%
Western Gas Partners, LP [Member]
Schedule of Investments [Line Items]
Units issued								619,510
Western Gas Partners, LP [Member] | Class C Units [Member]
Schedule of Investments [Line Items]
Units issued								619,510
Class C units, common units issued upon conversion								1
Western Gas Partners, LP [Member] | Class C Units [Member] | Other Subsidiaries Of Anadarko [Member]
Schedule of Investments [Line Items]
Units issued					10,913,853
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Series A Preferred Units March 2017 Conversion [Member]
Schedule of Investments [Line Items]
Series A Preferred units, percentage converted		50.00%
Series A Preferred units, common units issued upon conversion		1
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Series A Preferred Units May 2017 Conversion [Member]
Schedule of Investments [Line Items]
Series A Preferred units, percentage converted	50.00%
Series A Preferred units, common units issued upon conversion	1
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Private Investor [Member]
Schedule of Investments [Line Items]
Units issued							14,030,611		21,922,831
Western Gas Partners, LP [Member] | Series A Preferred Units [Member] | Private Investor [Member] | Over-Allotment Option [Member]
Schedule of Investments [Line Items]
Units issued						7,892,220

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Transactions with Affiliates - Gains (Losses) on Commodity Price Swap Agreements Table (Details) - Affiliates [Member] - Western Gas Partners, LP [Member] - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Gains (losses) on commodity price swap agreements related to sales and purchases
Gains (losses) on commodity price swap agreements		$ (1,043)	$ 7,410	$ (586)	$ 24,419
Sales [Member]
Gains (losses) on commodity price swap agreements related to sales and purchases
Gains (losses) on commodity price swap agreements	[1]	(926)	16,658	2,342	69,451
Sales [Member] | Natural Gas [Member]
Gains (losses) on commodity price swap agreements related to sales and purchases
Gains (losses) on commodity price swap agreements	[1]	6,284	719	12,022	12,962
Sales [Member] | Natural Gas Liquids [Member]
Gains (losses) on commodity price swap agreements related to sales and purchases
Gains (losses) on commodity price swap agreements	[1]	(7,210)	15,939	(9,680)	56,489
Purchases [Member]
Gains (losses) on commodity price swap agreements related to sales and purchases
Gains (losses) on commodity price swap agreements	[2]	$ (117)	$ (9,248)	$ (2,928)	$ (45,032)

[1] Reported in affiliate Natural gas and natural gas liquids sales in the consolidated statements of operations in the period in which the related sale is recorded.

[2] Reported in Cost of product in the consolidated statements of operations in the period in which the related purchase is recorded.

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Transactions with Affiliates - Commodity Price Swap Agreements Tables (Details) - Western Gas Partners, LP [Member]		Sep. 30, 2017 $ / MMBTU $ / bbl	Dec. 01, 2016 $ / MMBTU $ / bbl	Dec. 08, 2015 $ / MMBTU $ / bbl
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		18.41
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		47.08
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		62.09
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		54.62
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		72.88
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		76.47
DJ Basin Complex [Member] | Years 2016 - 2017 [Member] | Natural gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU		5.96
DJ Basin Complex [Member] | Year 2016 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]			0.60
DJ Basin Complex [Member] | Year 2016 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]			10.98
DJ Basin Complex [Member] | Year 2016 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]			17.23
DJ Basin Complex [Member] | Year 2016 [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]			16.86
DJ Basin Complex [Member] | Year 2016 [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]			26.15
DJ Basin Complex [Member] | Year 2016 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]			34.65
DJ Basin Complex [Member] | Year 2016 [Member] | Natural gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU	[1]			2.11
DJ Basin Complex [Member] | Year 2017 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]		5.09
DJ Basin Complex [Member] | Year 2017 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]		18.85
DJ Basin Complex [Member] | Year 2017 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]		26.83
DJ Basin Complex [Member] | Year 2017 [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]		26.20
DJ Basin Complex [Member] | Year 2017 [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]		41.84
DJ Basin Complex [Member] | Year 2017 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[1]		45.40
DJ Basin Complex [Member] | Year 2017 [Member] | Natural gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU	[1]		3.05
MGR Assets [Member] | Years 2016 - 2017 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		23.11
MGR Assets [Member] | Years 2016 - 2017 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		52.90
MGR Assets [Member] | Years 2016 - 2017 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		73.89
MGR Assets [Member] | Years 2016 - 2017 [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		64.93
MGR Assets [Member] | Years 2016 - 2017 [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		81.68
MGR Assets [Member] | Years 2016 - 2017 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price		81.68
MGR Assets [Member] | Years 2016 - 2017 [Member] | Natural gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity swap fixed price | $ / MMBTU		4.87
MGR Assets [Member] | Year 2017 [Member] | Ethane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[2]		4.08
MGR Assets [Member] | Year 2017 [Member] | Propane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[2]		19.24
MGR Assets [Member] | Year 2017 [Member] | Isobutane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[2]		25.79
MGR Assets [Member] | Year 2017 [Member] | Normal butane [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[2]		25.16
MGR Assets [Member] | Year 2017 [Member] | Natural gasoline [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[2]		45.01
MGR Assets [Member] | Year 2017 [Member] | Condensate [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price	[2]		53.55
MGR Assets [Member] | Year 2017 [Member] | Natural gas (per MMBtu) [Member]
Commodity Price Risk Swap [Line Items]
Commodity market price | $ / MMBTU	[2]		3.05

[1] Represents the New York Mercantile Exchange (“NYMEX”) forward strip price as of December 8, 2015 and December 1, 2016, for the 2016 Market Prices and 2017 Market Prices, respectively, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

[2] Represents the NYMEX forward strip price as of December 1, 2016, adjusted for product specification, location, basis and, in the case of NGLs, transportation and fractionation costs.

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Transactions with Affiliates - Equipment Purchases and Sales Table (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Related Party Transaction [Line Items]
Partners’ capital adjustment	$ (1,373)	$ 581
Western Gas Partners, LP [Member] | Affiliates [Member] | Purchases [Member]
Related Party Transaction [Line Items]
Cash consideration - purchases	3,910	3,965
Net carrying value	(5,283)	(3,366)
Partners’ capital adjustment	(1,373)	599
Western Gas Partners, LP [Member] | Affiliates [Member] | Sales [Member]
Related Party Transaction [Line Items]
Cash consideration - sales	0	623
Net carrying value	0	(605)
Partners’ capital adjustment	$ 0	$ (18)

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Transactions with Affiliates - Summary of Affiliate Transactions Table (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Related Party Transaction [Line Items]
Revenues and other		$ 574,695	$ 481,645	$ 1,616,338		$ 1,293,450
Equity income, net – affiliates	[1]	21,519	20,294	62,708		56,801
Cost of product	[2]	239,223	145,643	631,859		326,959
Operation and maintenance	[2]	79,536	74,755	229,444		226,141
General and administrative	[2]	12,922	12,112	37,595		36,514
Operating expenses		417,594	312,818	1,320,682		833,686
Interest income	[3]	4,225	4,225	12,675		12,675
Interest expense	[4]	36,117	31,301	108,447		76,869
Distributions to unitholders	[5]			324,290		276,114
Above-market component of swap agreements with Anadarko		18,049	18,417	46,719	[5]	34,782	[5]
Affiliates [Member]
Related Party Transaction [Line Items]
Revenues and other	[1]	351,127	325,312	982,595		900,301
Cost of product	[1]	22,902	21,254	60,497		67,979
Operation and maintenance	[6]	18,110	15,052	53,661		50,688
General and administrative	[7]	10,414	9,655	29,637		28,179
Operating expenses		51,426	45,961	143,795		146,846
Interest expense	[8]	0	(1,173)	71		(12,097)
Settlement of the Deferred purchase price obligation - Anadarko	[9]			(37,346)		0
Distributions to unitholders	[10]	94,205	77,462	264,533		235,587
Affiliates [Member] | Western Gas Partners, LP [Member]
Related Party Transaction [Line Items]
Distributions to unitholders	[11]	1,790	1,670	5,280		3,915
Affiliates [Member] | Deferred Purchase Price Obligation - Anadarko [Member]
Related Party Transaction [Line Items]
Settlement of the Deferred purchase price obligation - Anadarko	[12]	$ 0	$ 0	$ (37,346)		$ 0

[1] Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[2] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.9 million and $60.5 million for the three and nine months ended September 30, 2017, respectively, and $21.3 million and $68.0 million for the three and nine months ended September 30, 2016, respectively. Operation and maintenance includes charges from Anadarko of $18.1 million and $53.7 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $50.7 million for the three and nine months ended September 30, 2016, respectively. General and administrative includes charges from Anadarko of $10.4 million and $29.6 million for the three and nine months ended September 30, 2017, respectively, and $9.7 million and $28.2 million for the three and nine months ended September 30, 2016, respectively. See Note 5.

[3] Represents interest income recognized on the note receivable from Anadarko.

[4] Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $1.2 million and $12.1 million for the three and nine months ended September 30, 2016, respectively. See Note 2 and Note 9.

[5] See Note 5.

[6] Represents expenses incurred on and subsequent to the date of the acquisition of WES assets, as well as expenses incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES.

[7] Represents general and administrative expense incurred on and subsequent to the date of WES’s acquisition of WES assets, as well as a management services fee for reimbursement of expenses incurred by Anadarko for periods prior to the acquisition of WES assets by WES. These amounts include equity-based compensation expense allocated to WES and WGP by Anadarko (see WES LTIP and WGP LTIP and Anadarko Incentive Plan within this Note 5) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

[8] Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2 and Note 9).

[9] See Note 2.

[10] Represents distributions paid under WGP’s partnership agreement (see Note 3 and Note 4).

[11] Represents distributions paid to other subsidiaries of Anadarko under WES’s partnership agreement (see Note 3 and Note 4).

[12] Represents the cash payment to Anadarko for the settlement of the Deferred purchase price obligation - Anadarko (see Note 2).

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Transactions with Affiliates - Additional Information (Details) - USD ($)			1 Months Ended	3 Months Ended		9 Months Ended
		Nov. 01, 2012	May 31, 2008	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Note receivable - Anadarko				$ 260,000,000		$ 260,000,000		$ 260,000,000
Above-market component of swap agreements with Anadarko	[1]					46,719,000
Contributions of equity-based compensation to WES by Anadarko						$ 3,333,000
Western Gas Equity Partners Long Term Incentive Plan [Member]
Related Party Transaction [Line Items]
Units vesting period						3 years
Equity-based compensation expense				63,000	$ 57,000	$ 200,000	$ 200,000
Affiliates [Member] | Working Capital Facility [Member]
Related Party Transaction [Line Items]
Facility, maximum borrowing capacity		$ 30,000,000
Facility, expiration date		Nov. 01, 2017
Independent Director [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member]
Related Party Transaction [Line Items]
Units vesting period						1 year
Western Gas Partners, LP [Member] | Western Gas Equity Partners Long Term Incentive Plan [Member] | Anadarko Incentive Plan [Member]
Related Party Transaction [Line Items]
Equity-based compensation expense				1,200,000	1,400,000	$ 3,200,000	3,700,000
Contributions of equity-based compensation to WES by Anadarko						$ 3,300,000
Western Gas Partners, LP [Member] | Western Gas Partners Long Term Incentive Plan [Member]
Related Party Transaction [Line Items]
Units vesting period						3 years
Equity-based compensation expense				$ 100,000	$ 100,000	$ 300,000	$ 300,000
Western Gas Partners, LP [Member] | Natural Gas [Member] | Gathering, Treating and Transportation [Member]
Related Party Transaction [Line Items]
Affiliate throughput percent				33.00%	37.00%	34.00%	38.00%
Western Gas Partners, LP [Member] | Natural Gas [Member] | Processing [Member]
Related Party Transaction [Line Items]
Affiliate throughput percent				39.00%	51.00%	42.00%	55.00%
Western Gas Partners, LP [Member] | Crude, NGL and Produced Water [Member] | Gathering, Treating and Transportation [Member]
Related Party Transaction [Line Items]
Affiliate throughput percent				54.00%	67.00%	50.00%	64.00%
Western Gas Partners, LP [Member] | Affiliates [Member]
Related Party Transaction [Line Items]
Note receivable - Anadarko			$ 260,000,000	$ 260,000,000		$ 260,000,000
Note receivable, due date			May 14, 2038
Fixed annual rate for note receivable bearing interest			6.50%
Western Gas Partners, LP [Member] | Affiliates [Member] | Level 2 Inputs [Member] | Market Approach Valuation Technique [Member]
Related Party Transaction [Line Items]
Fair value of the note receivable				$ 313,200,000		$ 313,200,000		$ 313,300,000
Western Gas Partners, LP [Member] | Independent Director [Member] | Western Gas Partners Long Term Incentive Plan [Member]
Related Party Transaction [Line Items]
Units vesting period						1 year

[1] See Note 5.

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Property, Plant and Equipment - Historical Cost Table (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 7,582,178	$ 6,861,942
Accumulated depreciation	2,074,464	1,812,010
Net property, plant and equipment	5,507,714	5,049,932
Western Gas Partners, LP [Member] | Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	4,271	4,012
Western Gas Partners, LP [Member] | Gathering Systems and Processing Complexes [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 6,972,302	6,462,053
Western Gas Partners, LP [Member] | Gathering Systems and Processing Complexes [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Western Gas Partners, LP [Member] | Gathering Systems and Processing Complexes [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	47 years
Western Gas Partners, LP [Member] | Pipelines and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 139,344	139,646
Western Gas Partners, LP [Member] | Pipelines and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	15 years
Western Gas Partners, LP [Member] | Pipelines and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	45 years
Western Gas Partners, LP [Member] | Assets Under Construction [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 434,432	226,626
Western Gas Partners, LP [Member] | Other [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 31,829	$ 29,605
Western Gas Partners, LP [Member] | Other [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Western Gas Partners, LP [Member] | Other [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years

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Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Impairments		$ 2,159	$ 2,392	$ 170,079	$ 11,313	$ 15,500
Equity investment impairment loss	[1]			3,110
Western Gas Partners, LP [Member] | Fort Union [Member]
Property, Plant and Equipment [Line Items]
Equity investment impairment loss	[1]			3,110
Western Gas Partners, LP [Member] | Granger Complex [Member]
Property, Plant and Equipment [Line Items]
Impairments				158,800
Western Gas Partners, LP [Member] | Granger Complex [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 Inputs [Member] | Income Approach Valuation Technique [Member]
Property, Plant and Equipment [Line Items]
Estimated fair value		48,500		48,500
Western Gas Partners, LP [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Impairments				11,300		9,400
Western Gas Partners, LP [Member] | Granger Straddle Plant [Member]
Property, Plant and Equipment [Line Items]
Impairments				3,700
Western Gas Partners, LP [Member] | Granger Straddle Plant [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 Inputs [Member] | Income Approach Valuation Technique [Member]
Property, Plant and Equipment [Line Items]
Estimated salvage value		600		600
Western Gas Partners, LP [Member] | Northeast Wyoming Facility [Member]
Property, Plant and Equipment [Line Items]
Impairments				2,000
Western Gas Partners, LP [Member] | Northeast Wyoming Facility [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 Inputs [Member] | Market Approach Valuation Technique [Member]
Property, Plant and Equipment [Line Items]
Estimated salvage value		$ 400		$ 400
Western Gas Partners, LP [Member] | Newcastle System [Member]
Property, Plant and Equipment [Line Items]
Impairments						6,100
Western Gas Partners, LP [Member] | Newcastle System [Member] | Fair Value, Measurements, Nonrecurring [Member] | Level 3 Inputs [Member] | Income Approach Valuation Technique [Member]
Property, Plant and Equipment [Line Items]
Estimated fair value						$ 3,100

[1] Recorded in Impairments in the consolidated statements of operations.

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Equity Investments - Equity Investments Table (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Balance				$ 594,208
Investment earnings (loss), net of amortization	[1]	$ 21,519	$ 20,294	62,708		$ 56,801
Impairment expense	[2]			(3,110)
Contributions				384		(139)
Distributions				(64,313)		(59,671)
Distributions in excess of cumulative earnings				(16,255)	[3]	$ (16,592)
Balance		573,622		573,622
Western Gas Partners, LP [Member] | Fort Union [Member]
Schedule of Equity Method Investments [Line Items]
Balance				12,833
Investment earnings (loss), net of amortization				2,964
Impairment expense	[2]			(3,110)
Contributions				0
Distributions				(3,359)
Distributions in excess of cumulative earnings	[3]			(1,662)
Balance		7,666		7,666
Western Gas Partners, LP [Member] | White Cliffs [Member]
Schedule of Equity Method Investments [Line Items]
Balance				47,319
Investment earnings (loss), net of amortization				9,984
Impairment expense	[2]			0
Contributions				277
Distributions				(9,548)
Distributions in excess of cumulative earnings	[3]			(2,325)
Balance		45,707		45,707
Western Gas Partners, LP [Member] | Rendezvous [Member]
Schedule of Equity Method Investments [Line Items]
Balance				46,739
Investment earnings (loss), net of amortization				840
Impairment expense	[2]			0
Contributions				0
Distributions				(2,296)
Distributions in excess of cumulative earnings	[3]			(1,616)
Balance		43,667		43,667
Western Gas Partners, LP [Member] | Mont Belvieu JV [Member]
Schedule of Equity Method Investments [Line Items]
Balance				112,805
Investment earnings (loss), net of amortization				20,430
Impairment expense	[2]			0
Contributions				0
Distributions				(20,459)
Distributions in excess of cumulative earnings	[3]			(2,316)
Balance		110,460		110,460
Western Gas Partners, LP [Member] | Texas Express Gathering LLC [Member]
Schedule of Equity Method Investments [Line Items]
Balance				15,846
Investment earnings (loss), net of amortization				2,325
Impairment expense	[2]			0
Contributions				0
Distributions				(2,167)
Distributions in excess of cumulative earnings	[3]			0
Balance		16,004		16,004
Western Gas Partners, LP [Member] | Texas Express Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Balance				189,194
Investment earnings (loss), net of amortization				13,332
Impairment expense	[2]			0
Contributions				107
Distributions				(13,520)
Distributions in excess of cumulative earnings	[3]			(6,091)
Balance		183,022		183,022
Western Gas Partners, LP [Member] | Front Range Pipeline LLC [Member]
Schedule of Equity Method Investments [Line Items]
Balance				169,472
Investment earnings (loss), net of amortization				12,833
Impairment expense	[2]			0
Contributions				0
Distributions				(12,964)
Distributions in excess of cumulative earnings	[3]			(2,245)
Balance		$ 167,096		$ 167,096

[1] Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

[2] Recorded in Impairments in the consolidated statements of operations.

[3] Distributions in excess of cumulative earnings, classified as investing cash flows in the consolidated statements of cash flows, is calculated on an individual investment basis.

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Equity Investments - Additional Information (Details) - Western Gas Partners, LP [Member] - Fort Union [Member] $ in Millions	Sep. 30, 2017 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity investment difference between carrying and underlying value	$ 3.1
Fair Value, Measurements, Nonrecurring [Member] | Level 3 Inputs [Member] | Income Approach Valuation Technique [Member]
Schedule of Equity Method Investments [Line Items]
Equity investment fair value	$ 8.5

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Components of Working Capital - Accounts Receivable, Net Table (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Receivables [Abstract]
Trade receivables, net		$ 192,394	$ 192,606
Other receivables, net		43	30,415
Total accounts receivable, net	[1]	$ 192,437	$ 223,021

[1] Accounts receivable, net includes amounts receivable from affiliates (as defined in Note 1) of $78.3 million and $76.4 million as of September 30, 2017, and December 31, 2016, respectively. Accounts receivable, net as of December 31, 2016, also includes an insurance claim receivable related to an incident at the DBM complex. See Note 1.

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Components of Working Capital - Other Current Assets Table (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Current Assets [Line Items]
Natural gas liquids inventory	$ 8,459	$ 7,126
Imbalance receivables	2,103	3,483
Prepaid insurance	2,935	2,889
Total other current assets	$ 13,497	$ 13,498

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Components of Working Capital - Accrued Liabilities Table (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Components Of Working Capital [Abstract]
Accrued interest expense		$ 45,624	$ 39,834
Short-term asset retirement obligations		3,976	3,114
Short-term remediation and reclamation obligations		630	630
Income taxes payable		1,024	1,006
Other accrued liabilities		6,445	606
Total accrued liabilities	[1]	$ 57,699	$ 45,190

[1] Accrued liabilities includes affiliate amounts of $0.3 million and zero as of September 30, 2017, and December 31, 2016, respectively.

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Debt and Interest Expense - Debt Outstanding Table (Details) - USD ($)		Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt principal		$ 3,398,000,000	$ 3,148,000,000
Carrying value		3,371,886,000	3,119,461,000
Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	3,522,945,000	3,224,199,000
WGP RCF [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal		28,000,000	28,000,000
Carrying value		28,000,000	28,000,000
WGP RCF [Member] | Revolving Credit Facility [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	28,000,000	28,000,000
Western Gas Partners, LP [Member] | WES RCF [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal		250,000,000	0
Carrying value		250,000,000	0
Western Gas Partners, LP [Member] | WES RCF [Member] | Revolving Credit Facility [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	250,000,000	0
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Principal		500,000,000	500,000,000
Carrying value		495,541,000	494,734,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	536,712,000	536,252,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Principal		670,000,000	670,000,000
Carrying value		668,795,000	668,634,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	693,789,000	681,723,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 2.600% Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Principal		350,000,000	350,000,000
Carrying value		349,558,000	349,188,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 2.600% Senior Notes due 2018 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	351,770,000	351,531,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]
Debt Instrument [Line Items]
Principal		600,000,000	600,000,000
Carrying value		593,206,000	593,132,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	634,283,000	615,753,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Principal		500,000,000	500,000,000
Carrying value		491,653,000	490,971,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	503,322,000	492,499,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Principal		500,000,000	500,000,000
Carrying value		495,133,000	494,802,000
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member] | Market Approach Valuation Technique [Member] | Level 2 Inputs [Member]
Debt Instrument [Line Items]
Fair value	[1]	$ 525,069,000	$ 518,441,000

[1] Fair value is measured using the market approach and Level 2 inputs.

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Debt and Interest Expense - Debt Activity Table (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Debt Instrument [Line Items]
Beginning balance	$ 3,119,461
Other	2,425
Ending balance	3,371,886
Western Gas Partners, LP [Member] | Revolving Credit Facility [Member] | WES RCF [Member]
Debt Instrument [Line Items]
RCF borrowings	$ 250,000

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Debt and Interest Expense - Interest Expense Table (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Interest expense	[1]	$ (36,117)	$ (31,301)	$ (108,447)	$ (76,869)
Third Parties [Member]
Debt Instrument [Line Items]
Long-term debt		(36,223)	(31,795)	(106,412)	(88,123)
Amortization of debt issuance costs and commitment fees		(2,009)	(2,022)	(5,955)	(5,517)
Capitalized interest		2,115	1,343	3,991	4,674
Interest expense		(36,117)	(32,474)	(108,376)	(88,966)
Affiliates [Member]
Debt Instrument [Line Items]
Interest expense	[2]	0	1,173	(71)	12,097
Affiliates [Member] | Deferred Purchase Price Obligation - Anadarko [Member]
Debt Instrument [Line Items]
Deferred purchase price obligation - Anadarko	[3]	$ 0	$ 1,173	$ (71)	$ 12,097

[1] Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $1.2 million and $12.1 million for the three and nine months ended September 30, 2016, respectively. See Note 2 and Note 9.

[2] Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2 and Note 9).

[3] See Note 2 for a discussion of the Deferred purchase price obligation - Anadarko.

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Debt and Interest Expense - Additional Information (Details) - USD ($)		9 Months Ended
	Nov. 01, 2012	Sep. 30, 2017	Sep. 30, 2016
Working Capital Facility [Member] | Affiliates [Member]
Debt Instrument [Line Items]
Facility, outstanding borrowings		$ 0
Facility, available borrowing capacity		$ 30,000,000
Facility, interest rate at period end		2.74%	2.03%
Facility, expiration date	Nov. 01, 2017
WGP RCF [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility, outstanding borrowings		$ 28,000,000
Facility, available borrowing capacity		$ 222,000,000
Facility, interest rate at period end		3.24%	2.53%
Facility, fee rate		0.30%	0.30%
Facility, expiration date		Mar. 14, 2019
Western Gas Partners, LP [Member] | WES RCF [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Facility, outstanding borrowings		$ 250,000,000
Facility, available borrowing capacity		$ 945,400,000
Facility, interest rate at period end		2.54%	1.82%
Facility, fee rate		0.20%	0.20%
Outstanding letters of credit		$ 4,600,000
Facility, expiration date		Feb. 26, 2020
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.375% Senior Notes due 2021 [Member]
Debt Instrument [Line Items]
Fixed interest rate		5.375%
Debt instrument, maturity date		Jun. 01, 2021
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.000% Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Fixed interest rate		4.00%
Debt instrument, maturity date		Jul. 01, 2022
Western Gas Partners, LP [Member] | Senior Notes [Member] | 2.600% Senior Notes due 2018 [Member]
Debt Instrument [Line Items]
Fixed interest rate		2.60%
Debt instrument, maturity date		Aug. 15, 2018
Western Gas Partners, LP [Member] | Senior Notes [Member] | 5.450% Senior Notes due 2044 [Member]
Debt Instrument [Line Items]
Fixed interest rate		5.45%
Debt instrument, maturity date		Apr. 01, 2044
Western Gas Partners, LP [Member] | Senior Notes [Member] | 3.950% Senior Notes due 2025 [Member]
Debt Instrument [Line Items]
Fixed interest rate		3.95%
Debt instrument, maturity date		Jun. 01, 2025
Western Gas Partners, LP [Member] | Senior Notes [Member] | 4.650% Senior Notes due 2026 [Member]
Debt Instrument [Line Items]
Fixed interest rate		4.65%
Debt instrument, maturity date		Jul. 01, 2026

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Commitments and Contingencies - Additional Information (Details) - Western Gas Partners, LP [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Loss Contingencies [Line Items]
Committed capital	$ 143.3		$ 143.3
Rent expense associated with office, warehouse and equipment leases	$ 11.3	$ 8.9	$ 30.7	$ 26.2