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STOCKHOLDERS' EQUITY - Preferred Stock and Non-Cash Preferred Stock Dividend (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 8 Months Ended 12 Months Ended
Feb. 09, 2018
Apr. 06, 2017
Feb. 27, 2017
Jan. 24, 2017
Sep. 09, 2016
Jun. 30, 2017
Sep. 09, 2016
Dec. 31, 2018
Dec. 31, 2017
Mar. 16, 2017
Stockholders' equity                    
Shares issued 9,200,000 55,200,000     90,000,000          
Share price (in dollars per share) $ 6.90                  
Offering costs including placement agent fees               $ 3,044 $ 11,919  
Par value of common stock (in dollars per share) $ 0.0001       $ 0.0001   $ 0.0001 $ 0.0001 $ 0.0001  
8% Convertible Preferred Stock                    
Stockholders' equity                    
Shares issued     5,518              
Dividend rate (as a percent)       8.00%            
Preferred stock, par value (in dollars per share)       $ 0.0001            
Number of shares of common stock to be issued upon conversion       10,000            
Proceeds from issuance of convertible preferred stock per share     $ 72,500              
Gross proceeds from preferred stock offering     $ 400,100              
Share price (in dollars per share)     $ 7.25 $ 8.12            
Offering costs including placement agent fees     $ 11,900              
Par value of common stock (in dollars per share)                   $ 0.0001
Preferred dividend           $ 0        
Conversion price (in dollars per share)       $ 0.87            
Beneficial conversion proceeds       $ 48,000            
Discount amortization period       65 months            
Predecessor                    
Stockholders' equity                    
Offering costs including placement agent fees             $ 10