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DERIVATIVES - Derivative Gains (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Components of the derivative gain (loss)      
Total derivative gain (loss) $ (60,510) $ 53,462 $ (37,145)
Commodity derivative      
Components of the derivative gain (loss)      
Total derivative cash settlement gain (loss) (275,914) 49,406 1,691
Change in fair value gain (loss) 215,404 4,056 (38,836)
Total derivative gain (loss) (60,510) 53,462 (37,145)
Commodity derivative | Oil contracts      
Components of the derivative gain (loss)      
Total derivative cash settlement gain (loss) (215,057) 50,133 1,185
Commodity derivative | Gas contracts      
Components of the derivative gain (loss)      
Total derivative cash settlement gain (loss) (51,806) (727) 506
Commodity derivative | NGL sales      
Components of the derivative gain (loss)      
Total derivative cash settlement gain (loss) $ (9,051) $ 0 $ 0