Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cost of product	[1]	$ 77,799	$ 189,359
Operation and maintenance	[1]	88,279	73,760
General and administrative	[1]	14,964	13,476
Interest expense	[2]	(40,346)	(36,033)
Affiliates [Member]
Cost of product	[3]	20,244	15,988
Operation and maintenance	[4]	20,248	17,089
General and administrative	[5]	11,823	9,734
Interest expense	[6]	$ 0	$ (71)

[1] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $20.2 million and $16.0 million for the three months ended March 31, 2018 and 2017, respectively. Operation and maintenance includes charges from Anadarko of $20.2 million and $17.1 million for the three months ended March 31, 2018 and 2017, respectively. General and administrative includes charges from Anadarko of $11.8 million and $9.7 million for the three months ended March 31, 2018 and 2017, respectively. See Note 6.

[2] Includes affiliate (as defined in Note 1) amounts of zero and $(0.1) million for the three months ended March 31, 2018 and 2017, respectively. See Note 10.

[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 the 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 Anadarko Incentive Plan within this Note 6) and amounts charged by Anadarko under the WGP and WES omnibus agreements.

[6] Includes amounts related to the Deferred purchase price obligation - Anadarko (see Note 3 and Note 10).