Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Cash Receipts on Commodity Derivative Contract Settlements (Details)

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Derivative Financial Instruments - Cash Receipts on Commodity Derivative Contract Settlements (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Financial Instruments        
Derivative loss (gain) $ 73,137 $ 11,161 $ 179,156 $ (35,337)
Derivative cash (payments) receipts, net     (39,554) $ 42,028
Derivative cash premium (payments)     $ (32,368)