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Debt, Commitments and Contingencies - 2017 Facility (Details) - USD ($)
6 Months Ended
Jan. 20, 2021
Mar. 25, 2020
Jun. 30, 2021
Jun. 30, 2020
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 1,000,000    
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 $ 110,000,000.0   $ 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)       3.42%    
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%