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Long-term Debt (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 05, 2015
Jun. 04, 2015
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Debt, maximum allowed borrowing capacity $ 150,000 $ 125,000    
Increase option 100,000      
Debt outstanding     $ 79,600 $ 79,600
Interest rate     1.70%  
Fees $ 300      
Default interest rate above applicable interest rate     2.00%  
Revolver [Member] | LIBOR Rate [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate margin 1.75% 2.25%    
Revolver [Member] | LIBOR Rate [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate margin 1.25% 1.75%    
Letter Of Credit [Member]        
Debt Instrument [Line Items]        
Debt, maximum allowed borrowing capacity $ 15,000