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Derivatives - Derivative Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure        
Loss on derivative contracts $ 0 $ 30,104 $ 209 $ 48,434
Cash paid (received) on settlements     (5,078) 17,393
Commodity derivative contracts        
Derivative Instruments and Hedging Activities Disclosure        
Loss on derivative contracts 0 30,104 209 48,434
Cash paid (received) on settlements $ 0 $ 11,274 $ (5,078) $ 17,393