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OIL AND NATURAL GAS PROPERTIES (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 07, 2017
USD ($)
subsidiary
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / MMBTU
$ / bbl
Jun. 30, 2018
USD ($)
$ / MMBTU
$ / bbl
Dec. 31, 2017
USD ($)
Ceiling Limitation Disclosures            
First day average of the (WTI) crude oil spot price (in dollars per barrel) | $ / bbl       61.45 57.67  
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU       3.018 2.92  
Book value of oil and natural gas properties exceeding ceiling limit       $ 664,400    
Amount of unevaluated property costs transferred to the full cost pool   $ 51,000   $ 481,700    
Percentage of ownership interest sold 100.00%          
No of subsidiaries whose ownership interest sold | subsidiary 2          
Adjusted sale price $ 1,390,000          
Gain (loss) from sale of other operating property and equipment     $ (2,225)   $ (5,904) $ 485,900
Full cost ceiling impairment, before tax   $ 275,200