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Consolidated Statements of Equity and Partners' Capital - USD ($)
$ in Thousands
Total
Chipeta [Member]
WES Operating [Member]
Cumulative effect of accounting change [Member]
 [1]
Net Investment by Anadarko [Member]
Net Investment by Anadarko [Member]
Cumulative effect of accounting change [Member]
 [1]
Common Units [Member]
Common Units [Member]
Cumulative effect of accounting change [Member]
 [1]
General Partner [Member]
Noncontrolling Interests [Member]
Noncontrolling Interests [Member]
Chipeta [Member]
Noncontrolling Interests [Member]
WES Operating [Member]
Noncontrolling Interests [Member]
Cumulative effect of accounting change [Member]
 [1]
Balance at Dec. 31, 2017 $ 4,995,050     $ (43,750) $ 1,050,171 $ 629 $ 1,061,125 $ (14,200) $ 0 $ 2,883,754     $ (30,179)
Increase (Decrease) in Partners' Capital [Roll Forward]                          
Net income (loss) 630,654       182,142   369,429     79,083      
Distributions to noncontrolling interest owners   $ (13,529) $ (386,326)               $ (13,529) $ (386,326)  
Distributions to Partnership unitholders (502,457)           (502,457)            
Contributions of equity-based compensation from Anadarko/Occidental 5,741           5,741            
Net contributions from (distributions to) related parties 58,835       58,835                
Above-market component of swap agreements with Anadarko [2] 51,618           51,618            
WES Operating equity transactions, net [3] 0           (19,577)     19,577      
Net pre-acquisition contributions from (distributions to) related parties 97,755       97,755                
Adjustments of net deferred tax liabilities (1,514)       (1,514)                
Other 606           209     397      
Balance at Dec. 31, 2018 4,892,683       1,388,018   951,888   0 2,552,777      
Increase (Decrease) in Partners' Capital [Roll Forward]                          
Net income (loss) 807,700       29,279   662,325   5,637 110,459      
Distributions to noncontrolling interest owners   (9,663) (118,225)               (9,663) (118,225)  
Distributions to Partnership unitholders (969,073)           (969,073)            
Acquisitions from related parties [4] (2,007,501)       (2,149,218)   112,872     28,845      
Contributions of equity-based compensation from Anadarko/Occidental 13,968           13,968            
Net contributions from (distributions to) related parties (90)           (90)            
Cumulative impact of the Merger transactions [5] 0           3,169,800     (3,169,800)      
Issuance of general partner units [6] 0           19,861   (19,861)        
Above-market component of swap agreements with Anadarko [2] 7,407           7,407            
WES Operating equity transactions, net [3] 0           (755,197)     755,197      
Net pre-acquisition contributions from (distributions to) related parties 458,819       458,819                
Adjustments of net deferred tax liabilities 268,727       273,102   (4,375)            
Other 541           561     (20)      
Balance at Dec. 31, 2019 3,345,293       0   3,209,947   (14,224) 149,570      
Increase (Decrease) in Partners' Capital [Roll Forward]                          
Net income (loss) 516,852           515,908   11,104 (10,160)      
Distributions to noncontrolling interest owners   $ (8,644) $ (15,434)               $ (8,644) $ (15,434)  
Distributions to Partnership unitholders (695,834)           (681,746)   (14,088)        
Acquisitions from related parties 0           (3,987)     3,987      
Unit exchange with Occidental [2] (261,878)           (256,640)     (5,238)      
Unit repurchases [6] (32,535)           (32,535)            
Contributions of equity-based compensation from Anadarko/Occidental 14,604           14,604            
Equity-based compensation expense 7,857           7,857            
Net contributions from (distributions to) related parties [7] 24,466           4,466     20,000      
Other 465           465            
Balance at Dec. 31, 2020 $ 2,895,212       $ 0   $ 2,778,339   $ (17,208) $ 134,081      
[1] Includes the adoption of Revenue from Contracts with Customers (Topic 606) on January 1, 2018.
[2] See Note 6.
[3] For the years ended December 31, 2019 and 2018, the $755.2 million and $19.6 million decrease to partners’ capital, respectively, together with net income (loss) attributable to Western Midstream Partners, LP, totaled $(58.0) million and $532.0 million, respectively.
[4] The amounts allocated to common unitholders and noncontrolling interests represent a non-cash investing activity related to the assets and liabilities assumed in the AMA acquisition.
[5] See Note 1.
[6] See Note 5.
[7] See December 2019 Agreements—Services, Secondment, and Employee Transfer Agreement within Note 1.