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Debt (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Apr. 30, 2020
Jul. 31, 2019
Jun. 30, 2020
Debt      
Amount drawn on revolving line of credit     $ 100,000
Five-year revolving credit agreement | Senior secured debt      
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 $ 100,000    
Average interest rate   1.38%  
Five-year revolving credit agreement | Senior secured debt | Minimum      
Debt      
Interest coverage ratio   3.00  
Five-year revolving credit agreement | Senior secured debt | Maximum      
Debt      
Net total leverage ratio   4.00  
Senior secured leverage ratio   3.50  
Five-year revolving credit agreement | Senior secured debt | LIBOR | Minimum      
Debt      
Margin on base rate   0.875%  
Five-year revolving credit agreement | Senior secured debt | LIBOR | Maximum      
Debt      
Margin on base rate   1.375%  
Five-year revolving credit agreement | Senior secured debt | Adjusted base rate | Minimum      
Debt      
Margin on base rate   0.00%  
Five-year revolving credit agreement | Senior secured debt | Adjusted base rate | Maximum      
Debt      
Margin on base rate   0.375%