Consolidated Statements of Operations - WES Operating (Parenthetical) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Cost of product	[1]	$ 114,063	$ 94,318	[2]
Operation and maintenance	[1]	142,829	96,795	[2]
General and administrative	[1]	22,844	15,829	[2]
Interest expense	[3]	65,876	38,015	[2]
Affiliates [Member]
Cost of product	[4]	56,172	34,819
Operation and maintenance	[4]	39,141	23,001
General and administrative	[5]	18,894	12,688
Interest expense	[6]	1,833	577
WES Operating [Member]
Cost of product	[7]	114,063	94,318	[2]
Operation and maintenance	[7]	142,829	96,795	[2]
General and administrative	[7]	20,560	14,997	[2]
Interest expense	[8]	65,631	36,952	[2]
WES Operating [Member] | Affiliates [Member]
Cost of product	[4]	56,172	34,819
Operation and maintenance	[4]	39,141	23,001
General and administrative	[9]	18,498	12,479
Interest expense	[6]	$ 1,833	$ 577

[1] Cost of product includes product purchases from affiliates (as defined in Note 1) of $56.2 million and $34.8 million for the three months ended March 31, 2019 and 2018, respectively. Operation and maintenance includes charges from affiliates of $39.1 million and $23.0 million for the three months ended March 31, 2019 and 2018, respectively. General and administrative includes charges from affiliates of $18.9 million and $12.7 million for the three months ended March 31, 2019 and 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 $1.8 million and $0.6 million for the three months ended March 31, 2019 and 2018, respectively. See Note 1 and Note 10.

[4] Represents amounts earned or incurred on and subsequent to the date of the acquisition of Partnership assets, as well as amounts earned or incurred by Anadarko on a historical basis related to the Partnership assets prior to the acquisition of such assets.

[5] Represents general and administrative expense incurred on and subsequent to the date of the acquisition of Partnership assets, as well as a management services fee for expenses incurred by Anadarko for periods prior to the acquisition of such assets. These amounts include equity-based compensation expense allocated to the Partnership by Anadarko (see LTIPs and Anadarko Incentive Plan within this Note 6) and amounts charged by Anadarko under the omnibus agreements of the Partnership and WES Operating.

[6] Includes amounts related to the APCWH Note Payable (see Note 1 and Note 10).

[7] Cost of product includes product purchases from affiliates (as defined in Note 1) of $56.2 million and $34.8 million for the three months ended March 31, 2019 and 2018, respectively. Operation and maintenance includes charges from affiliates of $39.1 million and $23.0 million for the three months ended March 31, 2019 and 2018, respectively. General and administrative includes charges from affiliates of $18.5 million and $12.5 million for the three months ended March 31, 2019 and 2018, respectively. See Note 6.

[8] Includes affiliate (as defined in Note 1) amounts of $1.8 million and $0.6 million for the three months ended March 31, 2019 and 2018, respectively. See Note 1 and Note 10.

[9] Represents general and administrative expense incurred on and subsequent to the date of the acquisition of Partnership assets, as well as a management services fee for expenses incurred by Anadarko for periods prior to the acquisition of such assets. These amounts include equity-based compensation expense allocated to WES Operating by Anadarko (see LTIPs and Anadarko Incentive Plan within this Note 6) and amounts charged by Anadarko under the omnibus agreement of WES Operating.