Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Cost of product	[1]	$ 239,223	$ 145,643	$ 631,859	$ 326,959
Operation and maintenance	[1]	79,536	74,755	229,444	226,141
General and administrative	[1]	12,922	12,112	37,595	36,514
Interest expense	[2]	(36,117)	(31,301)	(108,447)	(76,869)
Affiliates [Member]
Cost of product	[3]	22,902	21,254	60,497	67,979
Operation and maintenance	[4]	18,110	15,052	53,661	50,688
General and administrative	[5]	10,414	9,655	29,637	28,179
Interest expense	[6]	$ 0	$ 1,173	$ (71)	$ 12,097

[1] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $22.9 million and $60.5 million for the three and nine months ended September 30, 2017, respectively, and $21.3 million and $68.0 million for the three and nine months ended September 30, 2016, respectively. Operation and maintenance includes charges from Anadarko of $18.1 million and $53.7 million for the three and nine months ended September 30, 2017, respectively, and $15.1 million and $50.7 million for the three and nine months ended September 30, 2016, respectively. General and administrative includes charges from Anadarko of $10.4 million and $29.6 million for the three and nine months ended September 30, 2017, respectively, and $9.7 million and $28.2 million for the three and nine months ended September 30, 2016, respectively. See Note 5.

[2] Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three and nine months ended September 30, 2017, respectively, and $1.2 million and $12.1 million for the three and nine months ended September 30, 2016, respectively. See Note 2 and Note 9.

[3] Represents amounts earned or incurred on and subsequent to the date of the acquisition of WES assets, as well as amounts earned or incurred by Anadarko on a historical basis related to WES assets prior to the acquisition of such assets by WES, recognized under gathering, treating or processing agreements, and purchase and sale agreements.

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

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

[6] Includes amounts related to WES’s Deferred purchase price obligation - Anadarko (see Note 2 and Note 9).