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FAIR VALUE MEASUREMENTS - Part 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Net assets (liabilities) at beginning of period $ (121,750) $ 5,583 $ (31,321) $ 30,772
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 46,797 (6,194) 28,028 (29,471)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, New Level 3 Derivatives (23,151) (2,033) (129,805) (5,140)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Unrealized Change Included in other comprehensive income (loss) (69,104) (2,700) (34,110) (1,505)
Net assets (liabilities) at end of period (167,208) (5,344) (167,208) (5,344)
Transfers in or out of level 3 $ 0 $ 0 $ 0 $ 0