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Debt - Credit Agreement, Additional Information (Details)
3 Months Ended 9 Months Ended
Aug. 31, 2018
USD ($)
covenant
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Debt Instrument [Line Items]          
Line of credit, maximum borrowing capacity $ 175,000,000.0        
Commitment fee percentage 0.15%        
Commitment fee percentage on unused capacity 0.30%        
Number of financial covenants | covenant 2        
Ratio of indebtedness to net capital 3.50        
Consolidated fixed charge coverage ratio 1.25        
Interest expense, debt       $ 600,000 $ 2,100,000
Maximum          
Debt Instrument [Line Items]          
Ratio of indebtedness to net capital 4.50        
Fed Funds Effective Rate Overnight Index Swap Rate          
Debt Instrument [Line Items]          
Basis spread on variable rate       0.005%  
Base Rate          
Debt Instrument [Line Items]          
Stated interest rate 1.00%        
Base Rate | Minimum          
Debt Instrument [Line Items]          
Stated interest rate 0.75%        
Base Rate | Maximum          
Debt Instrument [Line Items]          
Stated interest rate 1.50%        
London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Basis spread on variable rate       1.00%  
Stated interest rate 2.00%        
London Interbank Offered Rate (LIBOR) | Minimum          
Debt Instrument [Line Items]          
Stated interest rate 1.75%        
London Interbank Offered Rate (LIBOR) | Maximum          
Debt Instrument [Line Items]          
Stated interest rate 2.50%        
Revolving Credit Facility          
Debt Instrument [Line Items]          
Interest expense, debt   $ 200,000 $ 300,000 $ 600,000 $ 1,400,000