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INDEBTEDNESS - Estimated Fair Values of Debt Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Repayments of debt principal $ (2,075) $ (5,150) $ (4,150)
Issuance of Second Lien Notes as of August 6, 2019 981,050 1,000 0
Interest rate PIK 12,256 0 $ 0
Senior Notes      
Debt Instrument [Line Items]      
Total debt instruments 1,286,496    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 1,286,496    
Senior Notes | First Lien Term Loan      
Debt Instrument [Line Items]      
Total debt instruments 893,776    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 893,776    
Senior Notes | Second Lien Notes      
Debt Instrument [Line Items]      
Total debt instruments 392,720    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 392,720    
Senior Notes | Markets for Identical Item (Level 1)      
Debt Instrument [Line Items]      
Total debt instruments 0    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 0    
Senior Notes | Markets for Identical Item (Level 1) | First Lien Term Loan      
Debt Instrument [Line Items]      
Total debt instruments 0    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 0    
Senior Notes | Markets for Identical Item (Level 1) | Second Lien Notes      
Debt Instrument [Line Items]      
Total debt instruments 0    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 0    
Senior Notes | Significant Other Observable Inputs (Level 2)      
Debt Instrument [Line Items]      
Total debt instruments 922,688    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 922,688    
Senior Notes | Significant Other Observable Inputs (Level 2) | First Lien Term Loan      
Debt Instrument [Line Items]      
Total debt instruments 922,688    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 922,688    
Senior Notes | Significant Other Observable Inputs (Level 2) | Second Lien Notes      
Debt Instrument [Line Items]      
Total debt instruments 0    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 0    
Senior Notes | Significant Unobservable Inputs (Level 3)      
Debt Instrument [Line Items]      
Total debt instruments 411,119 551,882  
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, beginning of period 551,882    
Change in fair value (369)    
Repayments of debt principal (2,075)    
Retirements of Previous Term Loans (549,438)    
Total debt instruments, end of period 411,119 $ 551,882  
Senior Notes | Significant Unobservable Inputs (Level 3) | First Lien Term Loan      
Debt Instrument [Line Items]      
Total debt instruments 0    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Total debt instruments, end of period 0    
Senior Notes | Significant Unobservable Inputs (Level 3) | Second Lien Notes      
Debt Instrument [Line Items]      
Total debt instruments 411,119    
Debt Instrument, Changes In Long-Term Debt [Roll Forward]      
Change in fair value 10,863    
Issuance of Second Lien Notes as of August 6, 2019 388,000    
Interest rate PIK 12,256    
Total debt instruments, end of period $ 411,119