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FAIR VALUE MEASUREMENTS - Part 2 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Fair Value, Assets And Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]          
Net assets (liabilities) at beginning of period $ 57,401 $ 11,529 $ 40,484 $ 30,772 $ 40,484
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Settlements (34,478) (8,830)   (23,383) (32,624)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, New Level 3 Derivatives 3,407 4,545   2,002 5,598
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Unrealized Change Included in other comprehensive income (loss) (20,747) 12,030   (3,808) 5,816
Net assets (liabilities) at end of period $ 5,583 $ 19,274 11,529 5,583 $ 19,274
Transfers in or out of level 3     $ 0 $ 0