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Line of Credit (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 16, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Line of Credit Facility [Line Items]            
Amount outstanding under line of credit   $ 35,000,000   $ 35,000,000   $ 50,000,000
Interest expense on borrowings   $ 300,000 $ 100,000 $ 900,000 $ 100,000  
Line of Credit [Member]            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 85,000,000          
Line of Credit [Member] | US Bank [Member]            
Line of Credit Facility [Line Items]            
Effective interest rate   1.77%   1.77%    
Commitment fees       $ 0    
Line of Credit [Member] | US Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 1.25%          
Line of Credit [Member] | US Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 1.75%          
Line of Credit [Member] | US Bank [Member] | Base Rate [Member] | Minimum [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 0.00%          
Line of Credit [Member] | US Bank [Member] | Base Rate [Member] | Maximum [Member]            
Line of Credit Facility [Line Items]            
Basis spread on variable rate 0.50%          
Line of Credit [Member] | US Bank [Member] | Enson [Member]            
Line of Credit Facility [Line Items]            
Subsidiary ownership percentage securing facility 65.00%          
Letter of Credit [Member]            
Line of Credit Facility [Line Items]            
Letter of credit outstanding amount   $ 13,000   $ 13,000