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CONSOLIDATED BALANCE SHEETS - 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
Jun. 30, 2020
Oct. 02, 2019
Dec. 31, 2017
CONSOLIDATED BALANCE SHEETS                    
Financial Designation, Predecessor and Successor [Fixed List] Predecessor Successor Predecessor Predecessor Successor Successor Predecessor      
Current assets:                    
Cash and cash equivalents $ 15,546 $ 5,701 $ 15,546   $ 4,295 $ 5,701     $ 15,546  
Accounts receivable, net 37,826 48,504 37,826   32,242 48,504     37,826  
Assets from derivative contracts 15,310 4,995 15,310   8,559 4,995     15,310  
Restricted cash   4,574       4,574        
Prepaids and other 14,642 7,379 14,642   2,740 7,379     10,290  
Total current assets 84,787 71,153 84,787   47,836 71,153     92,811  
Oil and natural gas properties (full cost method):                    
Evaluated 2,155,288 420,609 2,155,288   509,274 420,609     380,364  
Unevaluated 438,365 105,009 438,365   75,494 105,009     108,954  
Gross oil and natural gas properties 2,593,653 525,618 2,593,653   584,768 525,618     489,318  
Less - accumulated depletion (1,709,719) (19,474) (1,709,719)   (295,163) (19,474)        
Net oil and natural gas properties 883,934 506,144 883,934   289,605 506,144     489,318  
Other operating property and equipment:                    
Other operating property and equipment 203,373 3,655 203,373   3,535 3,655     3,655  
Less - accumulated depreciation (14,416) (378) (14,416)   (1,149) (378)        
Net other operating property and equipment 188,957 3,277 188,957   2,386 3,277     3,655  
Other noncurrent assets:                    
Assets from derivative contracts 4,120 224 4,120   4,009 224     4,120  
Operating lease right of use assets 3,694 3,165 3,694   310 3,165     3,394  
Funds in escrow and other 1,138 703 1,138   2,351 703     1,138  
Total assets 1,166,630 584,666 1,166,630   346,497 584,666     594,436  
Current liabilities:                    
Accounts payable and accrued liabilities 112,578 97,333 112,578   58,928 97,333     115,305  
Liabilities from derivative contracts 6,829 8,069 6,829   22,125 8,069     6,829  
Current portion of long-term debt, net 258,234   258,234   1,720          
Operating lease liabilities 1,337 923 1,337   403 923   $ 500 913  
Asset retirement obligations   109       109        
Total current liabilities 378,978 106,434 378,978   83,176 106,434     123,047  
Long-term debt, net   144,000     158,489 144,000     130,000  
Liabilities subject to compromise 625,005   625,005              
Other noncurrent liabilities:                    
Liabilities from derivative contracts 1,625 4,854 1,625   4,291 4,854     1,625  
Asset retirement obligations 10,153 10,481 10,153   10,583 10,481     10,153  
Operating lease liabilities 2,438 2,247 2,438     2,247     2,482  
Commitments and contingencies (Note 12)        
Stockholders' equity:                    
Common stock 16 2 16   2 2     2  
Additional paid-in capital 1,087,441 327,108 1,087,441   330,123 327,108     327,127  
Retained earnings (accumulated deficit) (939,026) (10,460) (939,026)   (240,167) (10,460)        
Total stockholders' equity 148,431 316,650 148,431 $ 30,477 89,958 316,650 $ 1,197,044   327,129 $ 1,071,998
Total liabilities and stockholders' equity $ 1,166,630 $ 584,666 $ 1,166,630   $ 346,497 $ 584,666     $ 594,436