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Revolving Credit Facility (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 24, 2019
Line of Credit Facility [Line Items]      
Actual net worth for compliance $ 350,900,000    
Minimum net worth required for compliance $ 175,000,000.0    
Ratio of total liability to net worth 0.3    
Maximum ratio of total liability to net worth for compliance 2    
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Credit facility maximum borrowings $ 30,000,000.0   $ 23,000,000.0
Standby letter of credit 1,800,000    
Borrowings available under the revolving credit facility $ 28,200,000    
Frequency of periodic payments monthly    
Fees associated with unused portion of committed amount $ 0    
Borrowings outstanding under revolving credit facility $ 0 $ 0  
Weighted average interest rate 2.60% 4.30%  
Revolving Credit Facility | LIBOR      
Line of Credit Facility [Line Items]      
Stated percentage 2.00%