Quarterly report pursuant to Section 13 or 15(d)

PROPERTY AND EQUIPMENT (Schedule of Property and Equipment) (Details)

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PROPERTY AND EQUIPMENT (Schedule of Property and Equipment) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 10,551,713 $ 10,026,836
Other depreciable property and equipment 90,712 87,146
Land 5,521 5,521
Total property and equipment 10,647,946 10,119,503
Accumulated depletion, depreciation, amortization and impairment (5,063,413) (4,640,098)
Property and equipment, net $ 5,584,533 $ 5,479,405