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RELATED PARTY TRANSACTIONS - May 2018 Exchange and Related Transactions (Details) - USD ($)
12 Months Ended
Apr. 16, 2018
Apr. 10, 2018
Jan. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 05, 2018
May 15, 2018
Related Party Transaction [Line Items]                
Shares issued upon conversion of debt (in shares)       7,200,000        
Long-term debt       $ 1,118,161,000 $ 830,203,000      
Issuance of common stock       0 141,674,000 $ 0    
Purchase agreement amount     $ 40,000,000.0          
Lowest price per share (in dollars per share)     $ 1.50          
Number of shares issued in transaction (in shares) 3,600,000 58,666,667            
Offering price (in dollars per share)   $ 1.50            
Mr. Akradi                
Related Party Transaction [Line Items]                
Purchase agreement amount     $ 12,000,000.0          
Number of shares issued in transaction (in shares)   1,000,000.0 8,000,000.0          
Consideration received from transaction   $ 1,500,000            
Michael Reger                
Related Party Transaction [Line Items]                
Purchase agreement amount     $ 10,000,000.0          
Number of shares issued in transaction (in shares)     6,700,000          
TRT Holdings, Inc.                
Related Party Transaction [Line Items]                
Purchase agreement amount     $ 10,000,000.0          
Number of shares issued in transaction (in shares)     6,700,000          
Second Lien Notes due 2023                
Related Party Transaction [Line Items]                
Junior subordinated notes             $ 350,000,000.0  
Long-term debt       409,482,000 $ 690,203,000      
8% Senior Unsecured Notes Due 2020 | Investments of TRT Holdings, Inc. and Affiliates                
Related Party Transaction [Line Items]                
Interest rate percentage     8.00%          
Long-term debt     $ 204,700,000          
Exchange Agreement                
Related Party Transaction [Line Items]                
Issuance of common stock     140,000,000.0          
Purchase agreement amount     52,000,000.0          
Exchange Agreement | Common Stock                
Related Party Transaction [Line Items]                
Amount of debt converted     $ 155,000,000.0          
Shares issued upon conversion of debt (in shares)     54,600,000          
Exchange Agreement | TRT Holdings, Inc.                
Related Party Transaction [Line Items]                
Percentage of ownership before transaction     71.00%          
Exchange Agreement | Second Lien Notes due 2023                
Related Party Transaction [Line Items]                
Junior subordinated notes       $ 4,300,000       $ 344,300,000
Unsecured Debt | Exchange Agreement | 8% Senior Unsecured Notes Due 2020 | Investments of TRT Holdings, Inc. and Affiliates                
Related Party Transaction [Line Items]                
Converted debt amount     $ 496,700,000          
Secured Debt | Exchange Agreement | Second Lien Notes due 2023                
Related Party Transaction [Line Items]                
Long-term debt     $ 125,300,000