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Debt, Commitments and Contingencies - 2017 Facility (Details) - USD ($)
3 Months Ended
Mar. 25, 2020
Mar. 31, 2021
Mar. 31, 2020
Jan. 20, 2021
Dec. 31, 2020
Oct. 06, 2017
Debt Instrument [Line Items]            
Proceeds from credit facility   $ 0 $ 50,000,000      
Repayments of lines of credit   110,000,000 0      
Loss on early extinguishment of debt   185,000 $ 0      
Revolving Credit Facility | 2017 Facility            
Debt Instrument [Line Items]            
Proceeds from credit facility $ 50,000,000.0          
Repayments of lines of credit   110,000,000.0        
Loss on early extinguishment of debt   200,000        
Revolving Credit Facility | 2017 Facility | Line of Credit            
Debt Instrument [Line Items]            
Current borrowing capacity           $ 125,000,000.0
Long-term debt   $ 0   $ 110,000,000.0 $ 110,000,000.0 72,000,000.0
Maximum borrowing capacity           $ 175,000,000.0
Unused line commitment fee (percentage)   0.20%        
Effective interest rate (percent)     3.79%      
Revolving Credit Facility | 2017 Facility | Line of Credit | Federal Funds Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   0.50%        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   1.00%        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario One, Leverage Ratio            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio   1.00        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Two, Leverage Ratio | Minimum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio   1.00        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Two, Leverage Ratio | Maximum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio   2.00        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Three, Leverage Ratio | Minimum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio   2.00        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Three, Leverage Ratio | Maximum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio   3.00        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Scenario Four, Leverage Ratio | Maximum            
Debt Instrument [Line Items]            
Interest rate terms, leverage ratio   3.00        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Less than 1.00            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   1.50%        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Greater than or equal to 1.00 but less than 2.00            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   1.75%        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Greater Than Or Equal To 2.00 But Less Than 3.00            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   2.00%        
Revolving Credit Facility | 2017 Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Greater Than Or Equal To 3.00            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)   2.50%