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FAIR VALUE MEASUREMENTS - Part 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Net assets (liabilities) at beginning of period $ (41,794) $ 57,401 $ (31,321) $ 30,772
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements 17,731 (34,478) 26,852 (23,383)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, New Level 3 Derivatives (20,262) 3,407 (68,237) 2,002
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Unrealized Change Included in other comprehensive income (loss) (77,425) (20,747) (49,044) (3,808)
Net assets (liabilities) at end of period (121,750) 5,583 (121,750) 5,583
Transfers in or out of level 3 $ 0 $ 0 $ 0 $ 0