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Acquisitions and Divestitures - Purchase Price Allocation Table (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
[1]
Business Acquisition [Line Items]    
Goodwill $ 389,686 $ 389,087
Western Gas Partners, LP [Member] | Delaware Basin Midstream LLC [Member] | Level 3 Inputs [Member]    
Business Acquisition [Line Items]    
Current assets 60,888  
Property, plant and equipment 467,171  
Goodwill 284,749  
Other intangible assets 811,048  
Accounts payables (18,621)  
Accrued liabilities (37,360)  
Deferred income taxes (1,342)  
Asset retirement obligations and other (9,060)  
Total purchase price $ 1,557,473  
[1] Financial information has been recast to include the financial position and results attributable to the DBJV system. See Note 1 and Note 2.