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Consolidated Statements of Equity and Partners' Capital - WES Operating - USD ($)
$ in Thousands
Total
Chipeta [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 Interest [Member]
Noncontrolling Interest [Member]
Chipeta [Member]
Noncontrolling Interest [Member]
Cumulative effect of accounting change [Member]
 [1]
WES Operating [Member]
WES Operating [Member]
Chipeta [Member]
WES Operating [Member]
Cumulative effect of accounting change [Member]
 [2]
WES Operating [Member]
Net Investment by Anadarko [Member]
WES Operating [Member]
Net Investment by Anadarko [Member]
Cumulative effect of accounting change [Member]
 [2]
WES Operating [Member]
Common Units [Member]
WES Operating [Member]
Common Units [Member]
Cumulative effect of accounting change [Member]
 [2]
WES Operating [Member]
Class C Units [Member]
WES Operating [Member]
Class C Units [Member]
Cumulative effect of accounting change [Member]
 [2]
WES Operating [Member]
General Partner [Member]
WES Operating [Member]
General Partner [Member]
Cumulative effect of accounting change [Member]
 [2]
WES Operating [Member]
Noncontrolling Interest [Member]
WES Operating [Member]
Noncontrolling Interest [Member]
Chipeta [Member]
WES Operating [Member]
Noncontrolling Interest [Member]
Cumulative effect of accounting change [Member]
 [2]
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) $ 5,021,182   $ (43,750) $ 1,050,171 $ 629 $ 2,950,010 $ (41,108) $ 780,040 $ (3,533) $ 179,232 $ (696) $ 61,729   $ 958
Increase (Decrease) in Partners' Capital [Roll Forward]                                                  
Net income (loss) 630,654     182,142   369,429     79,083     636,526     182,142   87,581   11,656   346,538   8,609    
Above-market component of swap agreements with Anadarko 51,618 [3]         51,618 [3]           51,618 [4]         51,618 [4]                
Amortization of beneficial conversion feature of Class C units                       0         (3,247)   3,247            
Distributions to noncontrolling interest owners   $ (13,529)               $ (13,529)     $ (13,529)                     $ (13,529)  
Distributions to WES Operating unitholders (502,457)         (502,457)           (893,649)         (575,323)       (318,326)        
Contributions of equity-based compensation from Anadarko/Occidental 5,741         5,741           5,727         5,613       114        
Net contributions from (distributions to) related parties 58,835     58,835               58,835     58,835                    
Net pre-acquisition contributions from (distributions to) related parties 97,755     97,755               97,755     97,755                    
Adjustments of net deferred tax liabilities (1,514)     (1,514)               (1,514)     (1,514)                    
Other 606         209     397     396         396                
Balance at Dec. 31, 2018 4,892,683     1,388,018   951,888   0 2,552,777     4,919,597     1,388,018   2,475,540   791,410   206,862   57,767    
Increase (Decrease) in Partners' Capital [Roll Forward]                                                  
Net income (loss) 807,700     29,279   662,325   5,637 110,459     814,685     29,279   765,678   10,636   1,997   7,095    
Cumulative impact of the Merger transactions 0 [5]         3,169,800 [5]     (3,169,800) [5]     0 [6]         926,236 [6]   (802,588) [6]   (123,648) [6]        
Above-market component of swap agreements with Anadarko 7,407 [3]         7,407 [3]           7,407 [4]         7,407 [4]                
Amortization of beneficial conversion feature of Class C units                       0         (542)   542            
Distributions to noncontrolling interest owners   (9,663)               (9,663)     (9,663)                     (9,663)  
Distributions to WES Operating unitholders (969,073)         (969,073)           (1,124,388)         (1,039,158)       (85,230)        
Acquisitions from related parties (2,007,501) [7]     (2,149,218) [7]   112,872 [7]     28,845 [7]     (2,007,501) [8]     (2,149,218) [8]   141,717 [8]                
Contributions of equity-based compensation from Anadarko/Occidental 13,968         13,968           13,957         13,938       19        
Net contributions from (distributions to) related parties (90)         (90)           (90)         (90)                
Net pre-acquisition contributions from (distributions to) related parties 458,819     458,819               458,819     458,819                    
Adjustments of net deferred tax liabilities 268,727     273,102   (4,375)           268,727     273,102   (4,375)                
Other 541         561     (20)     269         269                
Balance at Dec. 31, 2019 3,345,293     0   3,209,947   (14,224) 149,570     3,341,819     0   3,286,620   0   0   55,199    
Increase (Decrease) in Partners' Capital [Roll Forward]                                                  
Net income (loss) 516,852         515,908   11,104 (10,160)     520,387         541,377           (20,990)    
Distributions to noncontrolling interest owners   $ (8,644)               $ (8,644)     $ (8,644)                     $ (8,644)  
Distributions to WES Operating unitholders (695,834)         (681,746)   (14,088)       (771,546)         (771,546)                
Acquisitions from related parties 0         (3,987)     3,987     0         (3,987)           3,987    
Contributions of equity-based compensation from Anadarko/Occidental 14,604         14,604           14,604         14,604                
Unit exchange with Occidental (261,878) [3]         (256,640) [3]     (5,238) [3]     (261,878) [4]         (261,878) [4]                
Net contributions from (distributions to) related parties 24,466 [9]         4,466 [9]     20,000 [9]     24,466 [10]         24,466 [10]                
Other 465         465           1,543         1,543                
Balance at Dec. 31, 2020 $ 2,895,212     $ 0   $ 2,778,339   $ (17,208) $ 134,081     $ 2,860,751     $ 0   $ 2,831,199   $ 0   $ 0   $ 29,552    
[1] Includes the adoption of Revenue from Contracts with Customers (Topic 606) on January 1, 2018.
[2] Includes the adoption of Revenue from Contracts with Customers (Topic 606) on January 1, 2018.
[3] See Note 6.
[4] See Note 6.
[5] See Note 1.
[6] See Note 1.
[7] 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.
[8] The amount allocated to common unitholders represents a non-cash investing activity related to the assets and liabilities assumed in the AMA acquisition.
[9] See December 2019 Agreements—Services, Secondment, and Employee Transfer Agreement within Note 1.
[10] See December 2019 Agreements—Services, Secondment, and Employee Transfer Agreement within Note 1.