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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers $ 440,100 $ 425,300 $ 285,700 $ 600,600 $ 757,000 $ 750,300 $ 680,400 $ 629,400 $ 1,751,709 $ 2,817,111 $ 1,806,473
Gain (loss) on crude contracts                 202,661 (856) (41,975)
Gain on sale of assets and other income                 12,971 12,798 26,903
Total revenues and other income                 1,967,341 2,829,053 1,791,401
Net crude oil and condensate revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 1,460,468 2,515,164 1,498,270
Net natural gas liquids revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 51,174 69,584 88,312
Net natural gas revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 240,067 232,363 219,891
United States | Net crude oil and condensate revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 353,311 750,278 786,537
United States | Net natural gas liquids revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 22,504 30,615 61,810
United States | Net natural gas revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 20,132 27,668 36,070
United States Offshore | Net crude oil and condensate revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 940,265 1,477,816 417,527
United States Offshore | Net natural gas liquids revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 19,749 26,968 11,832
United States Offshore | Net natural gas revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 49,300 46,259 17,559
Canada     | Net crude oil and condensate revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 93,591 116,174 111,836
Canada     | Net natural gas liquids revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 8,921 12,001 14,670
Canada     | Net natural gas revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 170,635 158,436 166,262
Canada Offshore | Net crude oil and condensate revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 71,495 159,254 176,291
Other | Net crude oil and condensate revenue                      
Disaggregation of Revenue [Line Items]                      
Revenue from contracts with customers                 $ 1,806 $ 11,642 $ 6,079