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Fair Value, Level 3 Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Derivative assets        
Balance at beginning of period $ 2,069 $ 400 $ 1,066 $ 324
Settlements (33,936) (18,364) (54,867) (32,521)
Realized gains recorded in earnings 31,867 17,964 53,801 32,197
Unrealized gains recorded in earnings 549 745 549 745
Balance at end of period $ 549 $ 745 $ 549 $ 745