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DEBT - Senior Secured Term Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 18, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt        
Payments of principal on senior secured term loans   $ 230,000 $ 6,250 $ 0
Term B Loan | Senior secured term loans        
Debt        
Loan amount $ 250,000      
Quarterly payment, as a percent of initial issue amount 2.50%      
Original interest discount $ 2,500      
Debt issuance costs $ 4,900      
Write-off of debt issuance costs   $ 5,700    
Wholly-owned, domestic guarantor subsidiaries | Financial Guarantee | Term B Loan | Senior secured term loans | Minimum        
Debt        
Threshold, as a percent of consolidated assets 5.00%      
Threshold, as a percent of consolidated net revenues 5.00%      
Other domestic restricted guarantor subsidiaries | Financial Guarantee | Senior secured term loans | Minimum        
Debt        
Threshold, as a percent of consolidated net revenues 10.00%      
Other domestic restricted guarantor subsidiaries | Financial Guarantee | Term B Loan | Senior secured term loans | Minimum        
Debt        
Threshold, as a percent of consolidated assets 10.00%      
LIBOR | Term B Loan | Senior secured term loans        
Debt        
Variable rate basis three-month LIBOR      
Basis spread on variable rate 4.50%      
LIBOR | Term B Loan | Interest rate option one | Senior secured term loans        
Debt        
Variable rate basis LIBOR      
Basis spread on variable rate 4.50%      
Base rate | Term B Loan | Interest rate option two | Senior secured term loans        
Debt        
Variable rate basis base rate      
Basis spread on variable rate 3.50%