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Line of Credit (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Line of Credit Facility [Line Items]          
Amount outstanding under line of credit $ 73,000,000   $ 73,000,000   $ 68,000,000
Interest expense on borrowings $ 400,000 $ 1,200,000 $ 1,100,000 $ 2,500,000  
Line of Credit | US Bank          
Line of Credit Facility [Line Items]          
Effective interest rate 1.43%   1.43%    
Line of Credit | US Bank | LIBOR | Minimum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.25%    
Line of Credit | US Bank | LIBOR | Maximum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     1.75%    
Line of Credit | US Bank | Base Rate | Minimum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.00%    
Line of Credit | US Bank | Base Rate | Maximum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate     0.50%    
Line of Credit | US Bank | Enson          
Line of Credit Facility [Line Items]          
Ownership interest used to secure obligations 65.00%   65.00%    
Line of Credit | Second Amended Credit Agreement          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity $ 125,000,000.0   $ 125,000,000.0    
Commitment fees     0    
Letter of Credit          
Line of Credit Facility [Line Items]          
Letter of credit outstanding amount $ 2,700,000   $ 2,700,000