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LONG-TERM DEBT - Narrative (Details)
12 Months Ended
Nov. 05, 2018
USD ($)
Nov. 01, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
Revolving Credit Facility        
Debt Instrument        
Maximum borrowing capacity $ 250,000,000      
Debt Instrument, Term 5 years      
Credit facility borrowings outstanding     $ 0  
Line of Credit Facility, Commitment Fee Percentage     25.00%  
Loans Payable | Term Loan due November 01, 2022        
Debt Instrument        
Maximum borrowing capacity   $ 275,000,000    
Debt Instrument, Term   5 years    
Basis spread on variable rate (as a percent)     3.98% 3.38%
Loans Payable | Term Loan due November 01, 2022 | Minimum        
Debt Instrument        
Interest coverage ratio     2.0  
Loans Payable | Term Loan due November 01, 2022 | Maximum        
Debt Instrument        
Leverage ratio     4.5  
Net leverage ratio     4.25  
Loans Payable | Term Loan due November 01, 2022 | LIBOR        
Debt Instrument        
Basis spread on variable rate (as a percent)     1.50% 2.00%
Loans Payable | Term Loan due November 01, 2022 | Quarterly payments for first three years | Base Rate        
Debt Instrument        
Basis spread on variable rate (as a percent)     1.25%  
Loans Payable | Term Loan due November 01, 2022 | Quarterly payments in fourth year | Base Rate        
Debt Instrument        
Basis spread on variable rate (as a percent)     2.50%  
Loans Payable | Term Loan due November 01, 2022 | Quarterly payments in fifth year | Base Rate        
Debt Instrument        
Basis spread on variable rate (as a percent)     3.75%