Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
Cost of product	[1]	$ 76,467	$ 139,408	[2]
Operation and maintenance	[1]	76,213	76,185	[2]
General and administrative	[1]	12,515	11,916	[2]
Interest expense	[3]	32,139	22,962	[2]
Affiliates [Member]
Cost of product	[4]	24,580	43,895
Operation and maintenance	[5]	17,975	16,817
General and administrative	[6]	9,150	8,335
Interest expense	[7]	$ 4,537	$ 1,422

[1] Cost of product includes product purchases from Anadarko (as defined in Note 1) of $24.6 million and $43.9 million for the three months ended March 31, 2016 and 2015, respectively. Operation and maintenance includes charges from Anadarko of $18.0 million and $16.8 million for the three months ended March 31, 2016 and 2015, respectively. General and administrative includes charges from Anadarko of $9.2 million and $8.3 million for the three months ended March 31, 2016 and 2015, respectively. See Note 5.

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

[3] Includes affiliate (as defined in Note 1) interest expense of $4.5 million and $1.4 million for the three months ended March 31, 2016 and 2015, respectively. See Note 2 and Note 9.

[4] Represents amounts earned or incurred on and subsequent to the date of 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.

[5] 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.

[6] 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 Plans within this Note 5) and amounts charged by Anadarko under the WGP omnibus agreement.

[7] For the three months ended March 31, 2016 and 2015, includes WES’s accretion expense recognized on the Deferred purchase price obligation - Anadarko for the acquisition of DBJV (see Note 2 and Note 9) and for the three months ended March 31, 2015, includes interest expense recognized on the WGP WCF (see Note 9).