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DERIVATIVE AND HEDGING ACTIVITIES - Realized Unrealized (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative and hedging activities        
Total net gain (loss) on derivative contracts $ (20,571) $ (15,843) $ (119,371) $ 67,695
Derivatives not designated as hedging contracts | Commodity contracts        
Derivative and hedging activities        
Total net gain (loss) on derivative contracts (20,571) (15,843) (119,371) 67,695
Derivatives not designated as hedging contracts | Commodity contracts | Other Income Expense        
Derivative and hedging activities        
Unrealized gain (loss) on commodity contracts 1,816 (21,128) (69,053) 24,029
Realized gain (loss) on commodity contracts $ (22,387) $ 5,285 $ (50,318) $ 43,666