Consolidated Statements of Operations - WES Operating (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total revenues and other	[1]	$ 2,772,592	$ 2,746,174	$ 2,299,658
Total operating expenses	[2]	2,129,063	1,750,943	1,635,157
Related Parties [Member]
Total revenues and other		1,820,612	1,607,396	1,353,711
Total operating expenses		182,712	503,246	334,155
WES Operating [Member]
Total revenues and other	[3]	2,772,592	2,746,174	2,299,658
Total operating expenses	[4]	2,125,511	1,744,124	1,631,128
WES Operating [Member] | Related Parties [Member]
Total revenues and other		1,800,000	1,600,000	1,400,000
Total operating expenses		$ 184,000	$ 501,400	$ 333,300

[1] Total revenues and other includes related-party amounts of $1.8 billion, $1.6 billion, and $1.4 billion for the years ended December 31, 2020, 2019, and 2018, respectively. See Note 6.

[2] Total operating expenses includes related-party amounts of $182.7 million, $503.2 million, and $334.2 million for the years ended December 31, 2020, 2019, and 2018, respectively. See Note 6.

[3] Total revenues and other includes related-party amounts of $1.8 billion, $1.6 billion, and $1.4 billion for the years ended December 31, 2020, 2019, and 2018, respectively. See Note 6.

[4] Total operating expenses includes related-party amounts of $184.0 million, $501.4 million, and $333.3 million for the years ended December 31, 2020, 2019, and 2018, respectively. See Note 6.