Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Schedule of Non-cash Gains or Losses on Derivative Contracts (Details)

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DERIVATIVE INSTRUMENTS AND PRICE RISK MANAGEMENT - Schedule of Non-cash Gains or Losses on Derivative Contracts (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Cash Received (Paid) on Settled Derivatives $ (27,855) $ 77,439 $ (35,152) $ 108,944
Non-Cash Mark-to-Market Gain (Loss) on Derivatives (173,057) (150,077) (301,695) 194,999
Gain (Loss) on Commodity Derivatives, Net $ (200,912) $ (72,638) $ (336,847) $ 303,943