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Debt (Details) - Five-year revolving credit agreement - Senior secured debt - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Apr. 30, 2020
Jul. 31, 2019
Mar. 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  
Amount drawn on revolving line of credit     $ 0
Minimum      
Debt      
Interest coverage ratio   3.00  
Maximum      
Debt      
Net total leverage ratio   4.00  
Senior secured leverage ratio   3.50  
Subsequent event      
Debt      
Amount drawn on revolving line of credit $ 100,000    
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%