Consolidated Statements of Operations - WES Operating (Parenthetical) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Cost of product	[1]	$ 122,877	$ 95,656	[2]	$ 236,940	$ 189,974	[2]
Operation and maintenance	[1]	148,431	112,789	[2]	291,260	209,584	[2]
General and administrative	[1]	30,027	15,597	[2]	52,871	31,426	[2]
Interest expense	[3]	79,472	42,245	[2]	145,348	80,260	[2]
Affiliates [Member]
Cost of product		68,225	38,001		124,397	72,820
Operation and maintenance		32,318	26,826		71,459	49,827
General and administrative		26,892	12,262		45,786	24,950
Interest expense		20	1,409		1,853	1,986
WES Operating [Member]
Cost of product	[4]	122,877	95,656	[2]	236,940	189,974	[2]
Operation and maintenance	[4]	148,431	112,789	[2]	291,260	209,584	[2]
General and administrative	[4]	28,101	14,901	[2]	48,661	29,898	[2]
Interest expense	[5]	79,472	41,937	[2]	145,103	78,889	[2]
WES Operating [Member] | Affiliates [Member]
Cost of product		68,200	38,000		124,400	72,800
Operation and maintenance		32,300	26,800		71,500	49,800
General and administrative		26,380	12,044		44,878	24,523
Interest expense		$ 20	$ 1,400		$ 1,900	$ 2,000

[1] Cost of product includes product purchases from affiliates (as defined in Note 1) of $68.2 million and $124.4 million for the three and six months ended June 30, 2019, respectively, and $38.0 million and $72.8 million for the three and six months ended June 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $32.3 million and $71.5 million for the three and six months ended June 30, 2019, respectively, and $26.8 million and $49.8 million for the three and six months ended June 30, 2018, respectively. General and administrative includes charges from affiliates of $26.9 million and $45.8 million for the three and six months ended June 30, 2019, respectively, and $12.3 million and $25.0 million for the three and six months ended June 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 (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.

[4] Cost of product includes product purchases from affiliates (as defined in Note 1) of $68.2 million and $124.4 million for the three and six months ended June 30, 2019, respectively, and $38.0 million and $72.8 million for the three and six months ended June 30, 2018, respectively. Operation and maintenance includes charges from affiliates of $32.3 million and $71.5 million for the three and six months ended June 30, 2019, respectively, and $26.8 million and $49.8 million for the three and six months ended June 30, 2018, respectively. General and administrative includes charges from affiliates of $26.4 million and $44.9 million for the three and six months ended June 30, 2019, respectively, and $12.0 million and $24.5 million for the three and six months ended June 30, 2018, respectively. See Note 6.

[5] Includes affiliate (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.