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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

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