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Derivative Financial Instruments - Summary of Mark-to-Market Gain (Losses) on Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Provisional gain (loss) on derivatives and commodity contracts $ (137) $ 713 $ (697) $ 1,213
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net 664 0 664 0
Fair value adjustments, net, pretax 37,239 10,067 33,440 1,248
Fair value adjustments, net $ 527 $ 713 $ (33) $ 1,213