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LONG TERM DEBT - Overview of 2018 Refinancing Transactions (Details)
6 Months Ended 12 Months Ended
Oct. 11, 2018
USD ($)
Oct. 05, 2018
USD ($)
May 15, 2018
USD ($)
shares
Apr. 16, 2018
shares
Apr. 10, 2018
shares
Jan. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
agreement
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility [Line Items]                    
Number of shares issued in transaction (in shares) | shares       3,600,000 58,666,667          
Number of exchange agreements | agreement             10      
Repayments of senior unsecured notes               $ 0 $ 104,215,000 $ 0
Repayments on line of credit               513,000,000 $ 50,000,000 $ 180,000,000
Unsecured Debt                    
Line of Credit Facility [Line Items]                    
Repayments on line of credit $ 102,800,000                  
Second Lien Notes due 2023                    
Line of Credit Facility [Line Items]                    
Junior subordinated notes   $ 350,000,000.0                
8% Senior Unsecured Notes Due 2020 | Investments of TRT Holdings, Inc. and Affiliates                    
Line of Credit Facility [Line Items]                    
Interest rate percentage           8.00%        
Term Loan | Line of Credit                    
Line of Credit Facility [Line Items]                    
Principal payments   $ 360,000,000.0                
Exchange Agreement | Unsecured Debt                    
Line of Credit Facility [Line Items]                    
Repayments of senior unsecured notes             $ 100,500,000      
Exchange Agreement | Second Lien Notes due 2023                    
Line of Credit Facility [Line Items]                    
Junior subordinated notes     $ 344,300,000         $ 4,300,000    
Exchange Agreement | 8% Senior Unsecured Notes Due 2020 | Unsecured Debt | Investments of TRT Holdings, Inc. and Affiliates                    
Line of Credit Facility [Line Items]                    
Converted debt amount           $ 496,700,000        
Other Supporting Noteholders | Exchange Agreement                    
Line of Credit Facility [Line Items]                    
Number of shares issued in transaction (in shares) | shares     103,200,000         32,800,000