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Line of Credit (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 09, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Line of Credit Facility [Line Items]            
Short-term Debt   $ 12,000   $ 12,000   $ 0
Interest Expense, Short-term Borrowings   17 $ 0 17 $ 0  
Line of Credit [Member]            
Line of Credit Facility [Line Items]            
Maximum borrowing capacity $ 55,000          
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   $ 13