Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Narrative) (Details)

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PROPERTY AND EQUIPMENT (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property, Plant and Equipment [Abstract]      
Impairment of oil and natural gas properties $ 0 $ 553,345,000  
Capitalized general and administrative costs 5,500,000 $ 5,400,000  
Non-producing leasehold costs 1,413,774,000   $ 1,457,043,000
Impairment of corporate headquarters $ 14,600,000