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Line of Credit (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jul. 01, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]        
Amount outstanding under line of credit $ 106,500,000     $ 101,500,000
Interest expense on borrowings $ 1,300,000 $ 1,100,000    
Line of Credit | US Bank        
Line of Credit Facility [Line Items]        
Effective interest rate 4.25%      
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%      
Line of Credit | Second Amended Credit Agreement        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 130,000,000      
Commitment fees 0      
Line of Credit | Second Amended Credit Agreement | Forecast        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity     $ 125,000,000  
Letter of Credit        
Line of Credit Facility [Line Items]        
Letter of credit outstanding amount $ 2,700,000