Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details)

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DERIVATIVE INSTRUMENTS (Derivative Instruments in Financial Position) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
May 17, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]      
Short-term derivative asset $ 2,142 $ 3,465 $ 27,146
Long-term derivative asset 961 8,183 322
Short-term derivative liability (560,722) (98,900) (11,641)
Long-term derivative liability (272,935) $ (80,742) (36,604)
Commodity Contracts      
Derivatives, Fair Value [Line Items]      
Short-term derivative asset 2,142   27,146
Long-term derivative asset 961   322
Short-term derivative liability (560,722)   (11,641)
Long-term derivative liability (272,935)   (36,604)
Total net (liability) asset derivative position $ (830,554)   $ (20,777)