Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014
Cash flows from operating activities
Net income (loss)		$ 103,991		$ 307,943	[1]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		183,715	[2],[3]	132,236	[1]
Impairments		276,229	[2],[3]	2,431	[1]
Non-cash equity-based compensation expense		3,453		3,333	[1]
Deferred income taxes		2,496		4,024	[1]
Accretion and amortization of long-term obligations, net		12,296		2,045	[1]
Equity income, net	[4],[5],[6]	(59,137)		(41,322)	[1]
Distributions from equity investment earnings	[5]	60,645		43,061	[1]
Gain on divestiture, net		(77,244)		0	[1]
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net		(24,265)		(52,681)	[1]
Increase (decrease) in accounts and natural gas imbalance payables and accrued liabilities, net		15,816		34,965	[1]
Change in other items, net		(1,184)		2,281	[1]
Net cash provided by operating activities		496,811		438,316	[1]
Cash flows from investing activities
Capital expenditures		(473,394)		(529,197)	[1]
Investments in equity affiliates		(9,052)		(63,267)	[1]
Distributions from equity investments in excess of cumulative earnings	[5]	12,409	[7]	14,387	[1]
Net cash used in investing activities		(337,989)		(950,282)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs		769,606		1,136,878	[1]
Repayments of debt		(611,150)		(480,000)	[1]
Increase (decrease) in outstanding checks		(1,482)		2,908	[1]
Distributions to WGP unitholders		(223,016)		(164,725)	[1]
Net contributions from Anadarko		31,467		23,600	[1]
Above-market component of swap extensions with Anadarko	[8]	7,916		0	[1]
Net cash provided by (used in) financing activities		(151,193)		477,100	[1]
Net increase (decrease) in cash and cash equivalents		7,629		(34,866)	[1]
Cash and cash equivalents at beginning of period		67,213	[9]	113,085	[1]
Cash and cash equivalents at end of period		74,842		78,219	[1]
Supplemental disclosures
Net distributions to (contributions from) Anadarko of other assets		4,386		6,398	[1]
Interest paid, net of capitalized interest		60,612		43,504	[1]
Taxes paid (reimbursements received)		(138)		(340)	[1]
Capital lease asset transfer	[10]	0		4,833	[1]
Western Gas Partners, LP [Member]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairments		276,229
Cash flows from financing activities
Proceeds from the issuance of WES common units, net of offering expenses		57,353		99,035	[1]
Distributions to noncontrolling interest owners of WES		(171,737)		(129,247)	[1]
Delaware Basin JV Gathering LLC [Member]
Cash flows from operating activities
Net income (loss)				14,238
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity income, net				0
Supplemental disclosures
Acquisition of DBJV from Anadarko	[11]	174,276		0	[1]
Chipeta Processing LLC [Member]
Cash flows from financing activities
Distributions to Chipeta noncontrolling interest owner		(10,150)		(11,349)	[1]
Affiliates [Member]
Cash flows from investing activities
Contributions in aid of construction costs from affiliates		0		183	[1]
Acquisitions		(12,131)		(372,393)	[1]
Proceeds from the sale of assets		700		0	[1]
Affiliates [Member] | Western Gas Partners, LP [Member]
Cash flows from financing activities
Distributions to WGP unitholders	[12]	(1,648)		(1,235)
Third Parties [Member]
Cash flows from investing activities
Acquisitions		(3,514)		0	[1]
Proceeds from the sale of assets		$ 146,993		$ 5	[1]

[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.

[2] “As Reported” amounts previously included as a component of Depreciation, amortization and impairments in WGP’s Original Filing.

[3] “As Reported” amounts previously included as a component of Depreciation, amortization and impairments in WGP’s Original Filing.

[4] Income earned from equity investments is classified as affiliate. See Note 1.

[5] Income earned on, distributions from and contributions to equity investments are classified as affiliate. See Note 1.

[6] Represents amounts earned or incurred on and subsequent to the date of 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. See Adjustments to Previously Issued Financial Statements in Note 1.

[7] 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.

[8] See Note 5.

[9] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.

[10] For the nine months ended September 30, 2014, represents transfers of $4.6 million from other long-term assets associated with the capital lease component of a processing agreement.

[11] See Note 2.

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