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Revolving Credit Facility (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Oct. 24, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Actual net worth for compliance $ 279,600,000    
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    
Standby letter of credit 1,300,000    
Borrowings available under the revolving credit facility $ 28,700,000    
Frequency of periodic payment monthly    
Fees associated with unused portion of committed amount $ 0    
Borrowings outstanding under revolving credit facility $ 0   $ 0
Revolving Credit Facility | Subsequent Event      
Line of Credit Facility [Line Items]      
Credit facility maximum borrowings   $ 23,000,000.0  
Percent of ownership previously required   25.00%  
Revolving Credit Facility | LIBOR      
Line of Credit Facility [Line Items]      
Stated percentage 2.00%