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DERIVATIVE FINANCIAL INSTRUMENTS (Level 3 Rollforward) (Details) - Crude Oil Forwards - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 0 $ 181 $ 6,545
Net unrealized gains (losses) recognized in earnings 0 (181) (6,364)
Purchases 0 0 314
Sales 0 0 (674)
Settlements 0 0 360
Ending Balance $ 0 $ 0 $ 181