Consolidated Statements of Cash Flows - WES Operating (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Borrowings, net of debt issuance costs	[1]	$ 3,681,173	$ 4,169,695	$ 2,671,337
Repayments of debt	[2]	3,803,888	1,467,595	1,040,000
Finance lease payments	[3]	14,207	508	0
WES Operating [Member]
Borrowings, net of debt issuance costs	[4]	3,681,173	4,169,695	2,671,344
Repayments of debt	[5]	3,803,888	1,439,595	1,040,000
Finance lease payments	[6]	14,207	508	0
Related Parties [Member]
Borrowings, net of debt issuance costs			11,000	321,800
Repayments of debt			439,600
Finance lease payments		6,382	508	0
Related Parties [Member] | WES Operating [Member]
Borrowings, net of debt issuance costs			11,000	$ 321,800
Repayments of debt			$ 439,600
Finance lease payments		$ 6,400

[1] For the years ended December 31, 2019 and 2018, includes $11.0 million and $321.8 million of borrowings, respectively, under the APCWH Note Payable.

[2] For the year ended December 31, 2019, includes a $439.6 million repayment to settle the APCWH Note Payable. See Note 6.

[3] For the year ended December 31, 2020, includes related-party payments of $6.4 million.

[4] For the years ended December 31, 2019 and 2018, includes $11.0 million and $321.8 million of borrowings, respectively, under the APCWH Note Payable.

[5] For the year ended December 31, 2019, includes a $439.6 million repayment to settle the APCWH Note Payable. See Note 6.

[6] For the year ended December 31, 2020, includes related-party payments of $6.4 million.