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Derivatives - Derivative Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure        
(Gain) loss on commodity derivative contracts $ 0 $ (2,241) $ 0 $ (12,467)
Cash received on settlements     0 10,577
Commodity derivative contracts        
Derivative Instruments and Hedging Activities Disclosure        
(Gain) loss on commodity derivative contracts 0 (2,241) 0 (12,467)
Cash received on settlements $ 0 $ 6,490 $ 0 $ 10,577