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FAIR VALUE MEASUREMENTS - Part 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]        
Net assets (liabilities) at beginning of period $ 5,583 $ 19,274 $ 30,772 $ 40,484
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (6,194) (12,380) (29,471) (38,044)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, New Level 3 Derivatives (2,033) 2,728 (5,140) 17,528
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Unrealized Change Included in other comprehensive income (loss) (2,700) 18,593 (1,505) 8,247
Net assets (liabilities) at end of period (5,344) 28,215 (5,344) 28,215
Transfers in or out of level 3 $ 0 $ 0 $ 0 $ 0