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OIL AND GAS PROPERTIES (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Oil and gas properties, successful efforts method:      
Unproved $ 24,984   $ 25,037
Proved 1,104,879   1,090,774
Work in progress 15,372   7,097
Total 1,145,235   1,122,908
Accumulated depletion, depreciation and amortization (403,500)   (379,961)
Total oil and gas properties, net 741,735   742,947
Capitalized interest 200 $ 600  
Impairment expenses of proved oil and gas properties $ 0   $ 0
Impairment expense   3,330  
Proved Oil And Gas Eagle Ford Formation assets located in Dimmit County, Texas      
Oil and gas properties, successful efforts method:      
Impairment expense   $ 3,300