Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Narrative) (Details)

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PROPERTY AND EQUIPMENT (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Property, Plant and Equipment [Abstract]          
Impairment of oil and natural gas properties $ 270,874 $ 571,442 $ 1,357,099 $ 571,442  
Capitalized general and administrative costs 6,200 $ 9,800 19,800 $ 26,300  
Non-producing leasehold costs $ 1,526,941   $ 1,526,941   $ 1,686,666