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Line of Credit (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Line of Credit Facility [Line Items]      
Amount outstanding under line of credit $ 141,000,000   $ 138,000,000
Interest expense on borrowings $ 1,100,000 $ 500,000  
Line of Credit | US Bank      
Line of Credit Facility [Line Items]      
Effective interest rate 3.34%    
Commitment fees $ 0    
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 $ 170,000,000    
Letter of Credit      
Line of Credit Facility [Line Items]      
Letter of credit outstanding amount $ 0