Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2015		Mar. 31, 2014
Cash flows from operating activities
Net income (loss)		$ (177,392)		$ 93,796	[1]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		62,070		40,895	[1]
Impairments		272,624	[2],[3]	1,190
Non-cash equity-based compensation expense		1,097		1,181	[1]
Deferred income taxes		3,283		993	[1]
Accretion and amortization of long-term obligations, net		2,112		680	[1]
Equity income, net	[4],[5],[6]	(18,220)		(9,251)	[1]
Distributions from equity investment earnings	[5]	18,706		10,269	[1]
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net		(17,798)		(15,434)	[1]
Increase (decrease) in accounts and natural gas imbalance payables and accrued liabilities, net		9,983		5,851	[1]
Change in other items, net		(1,010)		2,087	[1]
Net cash provided by operating activities		155,455		132,257	[1]
Cash flows from investing activities
Capital expenditures		(200,940)		(199,150)	[1]
Investments in equity affiliates		(4,878)		(28,462)	[1]
Distributions from equity investments in excess of cumulative earnings	[5]	2,964	[7]	2,044	[1]
Net cash used in investing activities		(203,960)		(586,520)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs		140,000		917,742	[1]
Repayments of debt		(31,150)		(430,000)	[1]
Increase (decrease) in outstanding checks		(2,468)		1,928	[1]
Distributions to WGP unitholders		(68,409)		(50,621)	[1]
Net contributions from Anadarko		30,096		23,838	[1]
Net cash provided by financing activities		41,115		435,297	[1]
Net increase (decrease) in cash and cash equivalents		(7,390)		(18,966)	[1]
Cash and cash equivalents at beginning of period		67,213	[8]	113,085	[1]
Cash and cash equivalents at end of period		59,823		94,119	[1]
Supplemental disclosures
Net distributions to (contributions from) Anadarko of other assets		348		(43)	[1]
Interest paid, net of capitalized interest		17,596		14,106	[1]
Taxes paid (reimbursements received)		(138)		(340)	[1]
Western Gas Partners [Member]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairments		272,624
Cash flows from financing activities
Proceeds from the issuance of WES common units, net of offering expenses		31,075		17,530	[1]
Distributions to noncontrolling interest owners of WES		(54,879)		(40,996)	[1]
Chipeta Processing Limited Liability Company [Member]
Cash flows from financing activities
Distributions to Chipeta noncontrolling interest owners		(3,150)		(4,124)	[1]
Affiliated Entity [Member]
Cash flows from investing activities
Acquisitions		(1,128)		(360,952)	[1]
Affiliated Entity [Member] | Western Gas Partners [Member]
Cash flows from financing activities
Distributions to WGP unitholders	[9]	(530)		(269)
Third Parties [Member]
Cash flows from investing activities
Proceeds from the sale of assets to third parties		22		0	[1]
Delaware Basin JV Gathering LLC [Member]
Cash flows from operating activities
Net income (loss)				3,621
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Equity income, net				0
Supplemental disclosures
Acquisition of DBJV from Anadarko	[10]	$ 174,276		$ 0

[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” amount previously included as a component of Depreciation, amortization and impairments in WGP’s Original Filing.

[3] “As Reported” amount 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] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.

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

[10] See Note 2.