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ADDITIONAL FINANCIAL STATEMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2019
Dec. 31, 2019
Oct. 01, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 02, 2019
Accounts receivable:                
Oil, natural gas and natural gas liquids revenues   $ 36,367     $ 22,781 $ 36,367    
Joint interest accounts   10,145     8,543 10,145    
Other   1,992     918 1,992    
Total $ 37,826 48,504 $ 37,826   32,242 48,504   $ 37,826
Prepaids and other:                
Prepaids   2,093     892 2,093    
Income tax receivable   1,250       1,250    
Funds in escrow   4,000     1,740 4,000    
Other   36     108 36    
Total 14,642 7,379 14,642   2,740 7,379   10,290
Funds in escrow and other:                
Oil, natural gas and natural gas liquids revenues         1,720      
Funds in escrow   580     581 580    
Other   123     50 123    
Total   703     2,351 703    
Accounts payable and accrued liabilities:                
Trade payables   36,038     22,740 36,038    
Accrued oil and natural gas capital costs   22,781     8,344 22,781    
Revenues and royalties payable   25,457     16,412 25,457    
Accrued interest expense   604     482 604    
Accrued employee compensation   2,947     3,223 2,947    
Accrued lease operating expenses   9,230     7,622 9,230    
Other   276     105 276    
Total $ 112,578 97,333 $ 112,578   58,928 97,333   $ 115,305
Other noncurrent assets:                
Other   $ 123     $ 50 $ 123    
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Successor Predecessor Predecessor Successor Successor Predecessor