Consolidated Statements of Operations - WES Operating (Parenthetical) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018		Sep. 30, 2019	Sep. 30, 2018
Cost of product	[1]	$ 97,800	$ 101,035	[2]	$ 334,740	$ 291,009	[2]
Operation and maintenance	[1]	176,572	129,042	[2]	467,832	338,626	[2]
General and administrative	[1]	30,769	16,022	[2]	83,640	47,448	[2]
Interest expense	[3]	78,524	48,869	[2]	223,872	129,129	[2]
Affiliates [Member]
Cost of product		61,066	39,702		185,463	112,522
Operation and maintenance		39,459	29,794		110,918	79,621
General and administrative		27,724	12,645		73,510	37,595
Interest expense		59	2,035		1,912	4,021
WES Operating [Member]
Cost of product	[4]	97,800	101,035	[2]	334,740	291,009	[2]
Operation and maintenance	[4]	176,572	129,042	[2]	467,832	338,626	[2]
General and administrative	[4]	29,072	15,331	[2]	77,733	45,229	[2]
Interest expense	[5]	78,524	48,544	[2]	223,627	127,433	[2]
WES Operating [Member] | Affiliates [Member]
Cost of product		61,100	39,700		185,500	112,500
Operation and maintenance		39,500	29,800		110,900	79,600
General and administrative		26,915	12,443		71,793	36,966
Interest expense		$ 60	$ 2,000		$ 1,900	$ 4,000

[1] Cost of product includes product purchases from affiliates (as defined in Note 1) of $61.1 million and $185.5 million for the three and nine months ended September 30, 2019, respectively, and $39.7 million and $112.5 million for the three and nine months ended September 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $39.5 million and $110.9 million for the three and nine months ended September 30, 2019, respectively, and $29.8 million and $79.6 million for the three and nine months ended September 30, 2018, respectively. General and administrative includes charges from affiliates of $27.7 million and $73.5 million for the three and nine months ended September 30, 2019, respectively, and $12.6 million and $37.6 million for the three and nine months ended September 30, 2018, respectively. See Note 6.

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

[3] Includes affiliate amounts of $0.06 million and $1.9 million for the three and nine months ended September 30, 2019, respectively, and $2.0 million and $4.0 million for the three and nine months ended September 30, 2018, respectively. See Note 1 and Note 10.

[4] Cost of product includes product purchases from affiliates (as defined in Note 1) of $61.1 million and $185.5 million for the three and nine months ended September 30, 2019, respectively, and $39.7 million and $112.5 million for the three and nine months ended September 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $39.5 million and $110.9 million for the three and nine months ended September 30, 2019, respectively, and $29.8 million and $79.6 million for the three and nine months ended September 30, 2018, respectively. General and administrative includes charges from affiliates of $26.9 million and $71.8 million for the three and nine months ended September 30, 2019, respectively, and $12.4 million and $37.0 million for the three and nine months ended September 30, 2018, respectively. See Note 6.

[5] Includes affiliate amounts of $0.06 million and $1.9 million for the three and nine months ended September 30, 2019, respectively, and $2.0 million and $4.0 million for the three and nine months ended September 30, 2018, respectively. See Note 1 and Note 10.