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BASIS OF PRESENTATION AND LIQUIDITY, MANAGEMENT'S PLANS AND GOING CONCERN (Supplemental Cash and Non Cash Information) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental disclosure of cash flow information:    
Cash paid for reorganization items, net $ 21,367 $ 0
Interest payments 4,763 14,034
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable - oil and natural gas sales (14,117) 47,111
(Increase) decrease in accounts receivable - joint interest and other (478) 6,001
Increase (decrease) in accounts payable and accrued liabilities 15,555 (7,637)
(Increase) decrease in prepaid expenses 26,356 (6,920)
(Increase) decrease in other assets (655) 1
Total changes in operating assets and liabilities 26,661 38,556
Supplemental disclosure of non-cash transactions:    
Capitalized stock-based compensation 630 934
Asset retirement obligation capitalized 483 381
Asset retirement obligation removed due to divestiture 0 (2,033)
Interest capitalized 0 187
Fair value of contingent consideration asset on date of divestiture   23,090
Foreign currency translation gain (loss) on equity method investments $ 2,570 $ (15,030)