Consolidated Statements of Cash Flows - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income (loss)		$ 512,260	$ 446,737	[1]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		362,977	270,757	[1]
Impairments		4,294	155,286	[1]
Non-cash equity-based compensation expense		9,489	4,834	[1]
Deferred income taxes		6,601	83,295	[1]
Accretion and amortization of long-term obligations, net		6,499	4,659	[1]
Equity income, net – affiliates		(175,483)	(133,874)	[1]
Distributions from equity investment earnings – affiliates		182,337	125,834	[1]
(Gain) loss on divestiture and other, net		1,403	(351)	[1]
(Gain) loss on interest-rate swaps		162,974	0	[1]
Lower of cost or market inventory adjustments		236	184	[1]
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net		(9,750)	(64,853)	[1]
Increase (decrease) in accounts and imbalance payables and accrued liabilities, net		(69,390)	61,081	[1]
Change in other items, net		32,238	11,606	[1]
Net cash provided by operating activities		1,026,685	965,195	[1]
Cash flows from investing activities
Capital expenditures		(947,266)	(1,589,653)	[1]
Investments in equity affiliates		(108,118)	(67,085)	[1]
Distributions from equity investments in excess of cumulative earnings – affiliates		21,203	19,816	[1]
Net cash used in investing activities		(3,134,643)	(1,798,702)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs	[2]	3,950,750	2,401,097	[1]
Repayments of debt	[3]	(1,467,595)	(1,040,000)	[1]
Increase (decrease) in outstanding checks		(9,204)	(2,687)	[1]
Registration expenses related to the issuance of Partnership common units		(855)	0	[1]
Distributions to Partnership unitholders	[4]	(688,193)	(372,189)	[1]
Net contributions from (distributions to) Anadarko		458,819	156,734	[1]
Above-market component of swap agreements with Anadarko	[4]	7,407	40,722	[1]
Finance lease payments – affiliates		(253)
Net cash provided by (used in) financing activities		2,133,246	886,796	[1]
Net increase (decrease) in cash and cash equivalents		25,288	53,289	[1]
Cash and cash equivalents at beginning of period	[1]	92,142	79,588
Cash and cash equivalents at end of period		117,430	132,877	[1]
Supplemental disclosures
Net distributions to (contributions from) Anadarko of other assets		0	(58,835)	[1]
Interest paid, net of capitalized interest		232,147	106,538	[1]
Taxes paid (reimbursements received)		96	(87)	[1]
Accrued capital expenditures		154,080	296,805	[1]
Chipeta [Member]
Cash flows from financing activities
Distributions to Chipeta noncontrolling interest owner		(5,200)	(9,446)	[1]
WES Operating [Member]
Cash flows from financing activities
Distributions to noncontrolling interest owner		(112,430)	(287,435)	[1]
Affiliates [Member]
Cash flows from investing activities
Acquisitions		(2,007,501)	(254)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs		11,000	265,500
Repayments of debt		(439,600)
Distributions to Partnership unitholders		(411,125)	(298,818)
Finance lease payments – affiliates		(253)	0	[1]
Affiliates [Member] | WES Operating [Member]
Cash flows from financing activities
Distributions to Partnership unitholders		(13,973)	(5,642)
Third Parties [Member]
Cash flows from investing activities
Acquisitions		(93,303)	(161,858)	[1]
Proceeds from the sale of assets		$ 342	$ 332	[1]

[1] Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.

[2] For the nine months ended September 30, 2019 and 2018, includes $11.0 million and $265.5 million of borrowings, respectively, under the APCWH Note Payable.

[3] For the nine months ended September 30, 2019, includes a $439.6 million repayment to settle the APCWH Note Payable. See Note 6.

[4] See Note 6.