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FRESH-START ACCOUNTING - Adjustments Made To Successor Company Stock and Additional Paid-in Capital (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 08, 2019
Oct. 02, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Oct. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2019
USD ($)
Feb. 09, 2018
$ / shares
Dec. 31, 2016
USD ($)
Sep. 09, 2016
$ / shares
Fresh-Start Adjustment                    
Par value of 16,203,940 shares of new common stock issued to holders of senior note claims and existing equity interest claims (valued at $19.74per share) | $   $ 2 $ 2 $ 16 $ 16          
Fair Value of warrants issued to holder of the Existing Equity Interests | $   7,336   7,336            
Additional paid-in-capital (Successor) | $   322,294                
Equity issuance costs | $   (2,503) (19) (2,503) (3,044) $ (11,919)        
Total stockholders' equity | $   $ 327,129 $ 316,650 $ 148,431 $ 1,197,044 $ 1,071,998 $ 30,477   $ 112,688  
Common stock, shares issued | shares   16,203,940 16,203,940              
Share Price | $ / shares   $ 19.74           $ 6.90    
Annualized Rate Of Increase To The Strike Price Of Warrants Issued 6.75 6.75                
Warrants exercise price (in dollars per share) | $ / shares                   $ 14.04
Measurement Input Implied Strike Price                    
Fresh-Start Adjustment                    
Warrants and Rights Outstanding, Measurement Input   19.74                
Measurement Input, Initial Strike Price | Series A Warrants                    
Fresh-Start Adjustment                    
Warrants exercise price (in dollars per share) | $ / shares   $ 40.17                
Measurement Input, Initial Strike Price | Series B Warrants                    
Fresh-Start Adjustment                    
Warrants exercise price (in dollars per share) | $ / shares   48.28                
Measurement Input, Initial Strike Price | SeriesC Warrants [Member]                    
Fresh-Start Adjustment                    
Warrants exercise price (in dollars per share) | $ / shares   $ 60.45                
Measurement Input, Price Volatility [Member]                    
Fresh-Start Adjustment                    
Warrants and Rights Outstanding, Measurement Input   45