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Segment Information - Reconciliation of Segment Information, Revenue and Other Operating (Loss) Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Revenue, Major Customer [Line Items]        
(Loss) Gain on Commodity Derivative Instruments $ (538,859) $ (63,303) $ (505,445) $ 51,839
Other Operating Income 6,815 3,753 12,700 8,711
Total Revenue and Other Operating (Loss) Income (127,210) 148,841 345,864 565,200
Operating Segments        
Revenue, Major Customer [Line Items]        
Total Segment Revenue from Contracts with External Customers $ 404,834 $ 208,391 $ 838,609 $ 504,650