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Line of Credit (Details) - USD ($)
3 Months Ended 9 Months Ended
Oct. 09, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 03, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]              
Short-term Debt   $ 47,000,000   $ 47,000,000     $ 0
Interest Expense, Short-term Borrowings   112,000 $ 0 129,000 $ 0    
Line of Credit [Member]              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 55,000,000         $ 65,000,000  
Line of Credit [Member] | US Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum              
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              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 1.75%            
Line of Credit [Member] | US Bank [Member] | Base Rate [Member] | Minimum              
Line of Credit Facility [Line Items]              
Basis spread on variable rate 0.00%            
Line of Credit [Member] | US Bank [Member] | Base Rate [Member] | Maximum              
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