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Debt (Details) - USD ($)
Jun. 12, 2020
Sep. 30, 2020
Letter of Credit | Line of Credit | Wells Fargo Securities, LLC    
Line of Credit Facility [Line Items]    
Unsecured revolving line of credit $ 10,000,000  
Revolving Credit Facility | Line of Credit | Wells Fargo Securities, LLC    
Line of Credit Facility [Line Items]    
Unsecured revolving line of credit 145,000,000  
Line of credit, accordion feature, higher borrowing capacity feature 105,000,000  
Secured Revolving Loan Facility | Line of Credit | Wells Fargo Securities, LLC    
Line of Credit Facility [Line Items]    
Unsecured revolving line of credit 75,000,000  
Secured Term Loan Facility | Line of Credit | Wells Fargo Securities, LLC    
Line of Credit Facility [Line Items]    
Unsecured revolving line of credit $ 70,000,000  
Line of credit facility, expiration period 60 days  
2020 term loan (effective interest rate of 3.0%)    
Line of Credit Facility [Line Items]    
Debt instrument, interest rate, stated percentage   3.00%
Credit Agreement    
Line of Credit Facility [Line Items]    
Debt instrument, covenant, leverage ratio, maximum 2.75  
Debt instrument, covenant, liquidity ratio leverage, minimum 1.25  
Minimum | Credit Agreement | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Quarterly commitment fee 0.375%  
Maximum | Credit Agreement | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Quarterly commitment fee 0.50%  
Base Rate | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Debt instrument, interest rate, stated percentage 0.50%  
Base Rate | Secured Term Loan Facility    
Line of Credit Facility [Line Items]    
Debt instrument, interest rate, stated percentage 1.25%  
Base Rate | Minimum | Credit Agreement | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Variable interest rate spread 1.25%  
Base Rate | Maximum | Credit Agreement | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Variable interest rate spread 1.75%  
London Interbank Offered Rate | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Debt instrument, interest rate, stated percentage 1.00%  
London Interbank Offered Rate | Minimum | Credit Agreement | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Variable interest rate spread 2.25%  
Quarterly commitment fee 0.375%  
Debt instrument, default interest rate 2.00%  
London Interbank Offered Rate | Maximum | Credit Agreement | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Variable interest rate spread 2.75%  
Quarterly commitment fee 0.50%