Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Schedule of Asset Retirement Obligation) (Details)

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PROPERTY AND EQUIPMENT (Schedule of Asset Retirement Obligation) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Asset retirement obligation, beginning of period $ 63,566 $ 60,355  
Liabilities incurred 483 381  
Liabilities removed due to divestitures 0 (2,033)  
Accretion expense 805 741  
Total asset retirement obligation as of end of period 64,854 59,444  
Less: amounts reclassified to liabilities subject to compromise (64,854) 0 $ (63,566)
Total asset retirement obligation reflected as non-current liabilities $ 0 $ 59,444