Equity and Partners' Capital (Tables)

12 Months Ended

Dec. 31, 2016

WES completed the following public offerings of its common units during 2015 and 2014, including through its Continuous Offering Programs (“COP”):



thousands except unit and per-unit amounts	WES Common Units Issued	WES GP Units Issued ⁽¹⁾	Price Per Unit		Underwriting Discount and Other Offering Expenses		Net Proceeds to WES
2014
$125.0 million COP ⁽²⁾	1,133,384	23,132	$	73.48	$	1,738	$	83,245
November 2014 equity offering ⁽³⁾	8,620,153	153,061	70.85		18,615		602,967
2015
$500.0 million COP ⁽⁴⁾	873,525	—	$	66.61	$	805	$	57,385


⁽¹⁾	Represents general partner units of WES issued to WES GP in exchange for WES GP’s proportionate capital contribution.

⁽²⁾

Represents common and general partner units of WES issued during the year ended December 31, 2014, under the $125.0 million COP. Gross proceeds generated (including WES GP’s proportionate capital contributions) during the year ended December 31, 2014, were $85.0 million. The price per unit in the table above represents an average price for all issuances under the $125.0 million COP during the year ended December 31, 2014. As of December 31, 2014, WES had used all the capacity to issue common units under this registration statement.


⁽³⁾	Includes the issuance of 1,120,153 WES common units pursuant to the partial exercise of the underwriters’ over-allotment option, the net proceeds from which were $77.0 million. Beginning with this partial exercise, WES GP elected not to make a corresponding capital contribution to maintain its 2.0% interest in WES.

⁽⁴⁾

Represents common units of WES issued during the year ended December 31, 2015, pursuant to WES’s registration statement filed with the SEC in August 2014 authorizing the issuance of up to an aggregate of $500.0 million of WES common units (the “$500.0 million COP”). Gross proceeds generated during the three months and year ended December 31, 2015, were zero and $58.2 million, respectively. Commissions paid during the three months and year ended December 31, 2015, were zero and $0.6 million, respectively. The price per unit in the table above represents an average price for all issuances under the $500.0 million COP during the year ended December 31, 2015.

Partnership Interests Table

The following table summarizes WES’s common, Class C, Series A Preferred and general partner units issued during the years ended December 31, 2016 and 2015:



	WES Common Units	WES Class C Units	WES Series A Preferred Units	WES General Partner Units	Total
Balance at December 31, 2014	127,695,130	10,913,853	—	2,583,068	141,192,051
PIK Class C units	—	498,009	—	—	498,009
Long-Term Incentive Plan award vestings	8,310	—	—	—	8,310
$500.0 million COP	873,525	—	—	—	873,525
Balance at December 31, 2015	128,576,965	11,411,862	—	2,583,068	142,571,895
PIK Class C units	—	946,261	—	—	946,261
Springfield acquisition	2,089,602	—	14,030,611	—	16,120,213
April 2016 Series A units	—	—	7,892,220	—	7,892,220
Long-Term Incentive Plan award vestings	5,403	—	—	—	5,403
Balance at December 31, 2016	130,671,970	12,358,123	21,922,831	2,583,068	167,535,992