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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

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