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DERIVATIVE AND HEDGING ACTIVITIES - Realized Unrealized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative and hedging activities        
Total net gain (loss) on derivative contracts $ (53,089) $ (34,761) $ (98,800) $ 83,538
Derivatives not designated as hedging contracts | Commodity contracts        
Derivative and hedging activities        
Total net gain (loss) on derivative contracts (53,089) (34,761) (98,800) 83,538
Derivatives not designated as hedging contracts | Commodity contracts | Other Income Expense        
Derivative and hedging activities        
Unrealized gain (loss) on commodity contracts (34,817) (67,221) (70,869) 45,157
Realized gain (loss) on commodity contracts $ (18,272) $ 32,460 $ (27,931) $ 38,381