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Line of Credit (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 14, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Sep. 19, 2016
Line of Credit Facility [Line Items]              
Amount outstanding under line of credit   $ 92,000,000   $ 92,000,000   $ 49,987,000  
Interest expense on borrowings   600,000 $ 300,000 1,100,000 $ 600,000    
Line of Credit              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity             $ 125,000,000
Letter of credit outstanding amount   $ 0   $ 0      
Line of Credit | US Bank              
Line of Credit Facility [Line Items]              
Effective interest rate   2.34%   2.34%      
Commitment fees       $ 0      
Line of Credit | US Bank | London Interbank Offered Rate (LIBOR) | Minimum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.25%            
Line of Credit | US Bank | London Interbank Offered Rate (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]              
Subsidiary ownership percentage securing facility 65.00%