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Debt (Details) - USD ($)
6 Months Ended
Jun. 12, 2020
Jun. 30, 2020
Jun. 30, 2019
Line of Credit Facility [Line Items]      
Proceeds from issuance of secured debt   $ 70,000,000.0 $ 0
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%