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OIL AND NATURAL GAS PROPERTIES (Details)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Oct. 31, 2019
Dec. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
$ / MMBTU
$ / bbl
Jun. 30, 2020
USD ($)
$ / bbl
Sep. 30, 2019
USD ($)
$ / MMBTU
$ / bbl
Jun. 30, 2019
USD ($)
$ / bbl
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
$ / bbl
Sep. 30, 2020
USD ($)
$ / MMBTU
$ / bbl
Sep. 30, 2019
USD ($)
Mar. 31, 2020
$ / bbl
Oct. 02, 2019
USD ($)
Oct. 01, 2019
USD ($)
Oil and Natural Gas Properties                          
Subject to depletion   $ 420,609 $ 520,453           $ 520,453     $ 380,364  
Not subject to depletion:                          
Total not subject to depletion   105,009 80,540           80,540     108,954  
Gross oil and natural gas properties   525,618 600,993           600,993     489,318  
Less accumulated depletion   (19,474) (254,849)           (254,849)        
Net oil and natural gas properties   $ 506,144 $ 346,144           $ 346,144     $ 489,318  
Ceiling Limitation Disclosures                          
Oil And Natural Gas, Evaluated Properties, Fair Value Disclosure                         $ 380,400
Oil And Natural Gas, Unevaluated Properties, Fair Value Disclosure                         109,000
First-day-of-month 12-month average price for natural gas (in $/MMBtu) | $ / MMBTU     1.970           1.970        
Amount of unevaluated property costs transferred to the full cost pool     $ 23,600       $ 51,000 $ 481,700          
Full cost ceiling impairment     $ 128,336 $ 60,100 $ 45,568 $ 664,400 $ 275,200   $ 188,443 $ 985,190      
First-day-of-month 12-month average price for crude oil used in ceiling test impairment (in dollars per barrel) | $ / bbl     43.63 47.37         43.63   55.96    
Financial Designation, Predecessor and Successor [Fixed List] Successor Successor Successor   Predecessor       Successor Predecessor      
Predecessor                          
Oil and Natural Gas Properties                          
Subject to depletion                         2,155,288
Not subject to depletion:                          
Total not subject to depletion                         438,365
Gross oil and natural gas properties                         2,593,653
Less accumulated depletion                         (1,709,719)
Net oil and natural gas properties                         $ 883,934
Ceiling Limitation Disclosures                          
First day average of the (WTI) crude oil spot price (in dollars per barrel) | $ / bbl         57.69                
First day average of the Henry Hub natural gas price (in dollars per Mmbtu) | $ / MMBTU         2.87                
Full cost ceiling impairment         $ 45,600                
First-day-of-month 12-month average price for crude oil used in ceiling test impairment (in dollars per barrel) | $ / bbl           61.45   61.45