Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash flows from operating activities
Net income	$ 90,175		$ 51,733	[1]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and impairments	40,612		32,440	[1]
Non-cash equity-based compensation expense	1,181		858	[1]
Deferred income taxes	290		9,270	[1]
Debt-related amortization and other items, net	680		560	[1]
Equity income, net	(9,251)	[2],[3]	(3,968)	[1],[2],[3]
Distributions from equity investment earnings	10,269	[3]	5,006	[1],[3]
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net	(10,976)		21,439	[1]
Increase (decrease) in accounts and natural gas imbalance payables and accrued liabilities, net	(2,583)		22,469	[1]
Change in other items, net	2,087		(2,431)	[1]
Net cash provided by operating activities	122,484		137,376	[1]
Cash flows from investing activities
Capital expenditures	(189,327)		(166,463)	[1]
Investments in equity affiliates	(27,605)		(64,580)	[1]
Distributions from equity investments in excess of cumulative earnings	2,044	[3]	0	[1],[3]
Other	(857)		0	[1]
Net cash used in investing activities	(576,697)		(831,633)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs	917,742		384,946	[1]
Repayments of debt	(430,000)		0	[1]
Increase (decrease) in outstanding checks	1,928		(2,808)	[1]
Offering expenses from the issuance of WGP common units	0		(2,367)	[1]
Distributions to WGP unitholders	(50,621)		(7,852)	[1]
Distributions to noncontrolling interest owners of WES	(40,996)		(28,789)	[1]
Net contributions from Anadarko	23,788		21,588	[1]
Net cash provided by financing activities	435,247		363,165	[1]
Net increase (decrease) in cash and cash equivalents	(18,966)		(331,092)	[1]
Cash and cash equivalents at beginning of period	113,085	[1]	422,556	[1]
Cash and cash equivalents at end of period	94,119		91,464	[1]
Supplemental disclosures
Net contributions from Anadarko of other assets	(43)		(6)	[1]
Interest paid, net of capitalized interest	14,106		11,244	[1]
Taxes paid (reimbursements received)	(340)		0	[1]
Western Gas Partners [Member]
Cash flows from financing activities
Proceeds from issuance of WES common units, net of offering expenses	17,530		0	[1]
Affiliated Entity [Member]
Cash flows from investing activities
Acquisitions	(360,952)		(465,721)	[1]
Third Parties [Member]
Cash flows from investing activities
Acquisitions	0		(134,869)	[1]
Chipeta Processing Limited Liability Company [Member]
Cash flows from financing activities
Contributions received from Chipeta noncontrolling interest owner	0		1,097	[1]
Distributions to Chipeta noncontrolling interest owner	$ (4,124)		$ (2,650)	[1]

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

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

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