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Line of Credit (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Line of Credit Facility [Line Items]          
Amount outstanding under line of credit $ 88,000,000   $ 88,000,000   $ 101,500,000
Interest expense on borrowings $ 900,000 $ 1,200,000 $ 3,400,000 $ 3,700,000  
Line of Credit | US Bank          
Line of Credit Facility [Line Items]          
Effective interest rate 3.55%   3.55%    
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   $ 125,000,000    
Commitment fees     0    
Letter of Credit          
Line of Credit Facility [Line Items]          
Letter of credit outstanding amount $ 2,700,000   $ 2,700,000