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Long-Term Debt (Narrative) (Details) - Credit Agreement [Member] - Capital One, National Association [Member] - USD ($)
1 Months Ended 3 Months Ended
Sep. 12, 2019
Oct. 31, 2018
Oct. 30, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt Instrument [Line Items]            
Maximum aggregate loan amount available   $ 269,600,000   $ 112,800,000    
Debt instrument, maturity date   May 08, 2023        
Debt instrument total net leverage ratio     4.25%      
Line of credit outstanding amount       8,700,000    
Delayed Draw Term Loan [Member]            
Debt Instrument [Line Items]            
Maximum aggregate loan amount available   $ 19,600,000        
Term Loan [Member]            
Debt Instrument [Line Items]            
Line of credit outstanding amount       $ 17,900,000   $ 18,100,000
Debt instrument stated interest rate       1.86%   1.90%
Maximum [Member]            
Debt Instrument [Line Items]            
Debt instrument total net leverage ratio   3.75%        
Federal Funds Rate [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   0.50%        
London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   1.00%        
London Interbank Offered Rate (LIBOR) | Minimum [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   0.00%        
Based On Applicable Senior Leverage Ratio | Minimum [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   0.75%        
Based On Applicable Senior Leverage Ratio | Maximum [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   1.50%        
Based On Applicable Leverage Ratio [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   1.75%        
Based On Applicable Leverage Ratio [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Debt instrument variable interest rate margin   2.50%        
Restriction on Dividends [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Aggregate amount of dividends and distributions       $ 7,500,000    
Revolving Credit Loan [Member]            
Debt Instrument [Line Items]            
Maximum aggregate loan amount available $ 300,000,000.0 $ 250,000,000.0        
Increase in credit facility $ 50,000,000.0          
Proceeds from line of credit       0 $ 0  
Line of credit outstanding amount       $ 178,500,000   $ 178,500,000
Debt instrument stated interest rate       1.86%   1.90%
Revolving Credit Loan [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Fee charged on unused portion of revolving credit facility       0.20%    
Revolving Credit Loan [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Fee charged on unused portion of revolving credit facility       0.35%