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Segment Information - Reconciliation of Segment Information, Revenue and Other Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Gain (Loss) on Commodity Derivative Instruments | $ 172,982 | $ 376,105 | $ (30,212)
Other Operating Income | 17,749 | 13,678 | 26,942
Total Consolidated Revenue and Other Operating Income | 1,257,978 | 1,922,449 | 1,730,434
Operating Segments |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Total Segment Revenue from Contracts with External Customers | $ 1,067,247 | $ 1,532,666 | $ 1,733,704

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