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Debt (Details) - Five-year revolving credit agreement - Senior secured debt - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2019
Dec. 31, 2020
Debt    
Term of credit agreement 5 years  
Maximum borrowing capacity $ 250,000  
Maximum borrowing capacity, subject to additional lender commitments and satisfaction of other requirements $ 375,000  
Outstanding borrowings   $ 100,000
Minimum    
Debt    
Interest coverage ratio 3.00  
Maximum    
Debt    
Net total leverage ratio 4.00  
Senior secured leverage ratio 3.50  
LIBOR | Minimum    
Debt    
Margin on base rate 0.875%  
LIBOR | Maximum    
Debt    
Margin on base rate 1.375%  
Adjusted base rate | Minimum    
Debt    
Margin on base rate 0.00%  
Adjusted base rate | Maximum    
Debt    
Margin on base rate 0.375%