Equity and Partners' Capital (Tables)

3 Months Ended

Mar. 31, 2016

Partners' Capital Notes [Abstract]

Partnership Interests Table

The following table summarizes WES’s common, Class C, Series A Preferred and general partner units issued during the three months ended March 31, 2016:

	WES Common Units	WES Class C Units	WES Series A Preferred Units	WES General Partner Units	Total
Balance at December 31, 2015	128,576,965	11,411,862	—	2,583,068	142,571,895
PIK Class C units	—	323,584	—	—	323,584
Springfield acquisition	2,089,602	—	14,030,611	—	16,120,213
Balance at March 31, 2016	130,666,567	11,735,446	14,030,611	2,583,068	159,015,692