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LONG-TERM DEBT - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Nov. 05, 2018
USD ($)
Debt Instrument      
Outstanding balance $ 705,987,000 $ 712,277,000  
3.875% Senior Notes | Senior Notes      
Debt Instrument      
Leverage ratio, maximum 3.75    
Term Loan | Term Loan      
Debt Instrument      
Outstanding balance $ 213,100,000 $ 220,000,000.0  
Prepaid debt principal payments $ 6,900,000    
Basis spread on variable rate (as a percent) 2.10% 2.16%  
Term Loan | Term Loan | Minimum      
Debt Instrument      
Interest coverage ratio (not less than) 2.0    
Leverage ratio limiting ability to pay dividends, make distributions or repurchase stock 4.25    
Term Loan | Term Loan | Maximum      
Debt Instrument      
Net leverage ratio (not more than) 4.5    
Term Loan | Term Loan | LIBOR      
Debt Instrument      
Basis spread on variable rate (as a percent) 2.00% 2.00%  
Credit Facility | Revolving Credit Facility      
Debt Instrument      
Maximum borrowing capacity of credit facility     $ 250,000,000.0
Outstanding borrowings under credit facility $ 0 $ 0  
Commitment fee rate (as a percent) 0.35% 0.35%