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INCOME TAXES - Operating loss carryforward (Details) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2019
Oct. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2019
Oct. 01, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
INCOME TAXES                      
Financial Designation, Predecessor and Successor [Fixed List] Predecessor       Successor Predecessor Predecessor Successor Successor Predecessor  
Expiration of net operating losses $ 454,200   $ 891,500     $ 454,200       $ 891,500  
Deferred tax expense     95,800     (95,791)   $ 0   95,791  
Net operating loss carryforwards               905,200      
Net operating loss carryforward subject expiration in 2037               $ 105,600      
Carryforward period of NOLs that will expire in 2037               20 years      
Net operating carryforward not subject to expiration               $ 345,400      
Valuation allowance       $ 478,690 $ 478,690     489,539 $ 478,690    
Decrease in valuation allowance               10,800      
Unrecognized tax benefits 0 $ 0 $ 0 0 $ 0 $ 0 $ 0 $ 0 0 0 $ 0
Open tax year (in years)               3 years      
Interest and penalties $ 0 $ 0   $ 0     $ 0 $ 0 $ 0 $ 0 $ 0