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Derivative and Hedging Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jul. 01, 2014
Jun. 30, 2015
Jul. 01, 2014
Dec. 30, 2014
Fair value of derivative instruments          
Total Derivative Contracts $ 697   $ 697   $ 1,375
Interest rate cash flow hedges          
Gain recognized in AOCI, net of tax (effective portion) 215 $ 196 416 $ 376  
Loss reclassified from AOCI to income (effective portion) 367 $ 383 736 $ 740  
Other accrued liabilities          
Fair value of derivative instruments          
Fair value of Derivative Liabilities, Interest rate swaps 697   697   $ 1,375
Interest rate swap, entered October 22, 2008          
Interest rate cash flow hedges          
Notional amount of interest rate swap 25,000   25,000    
Notional amount of hedge obligation $ 25,000   $ 25,000    
Fixed interest rate of derivative (as a percent) 3.83%   3.83%    
Interest rate swap, entered January 7, 2009          
Interest rate cash flow hedges          
Notional amount of interest rate swap $ 25,000   $ 25,000    
Notional amount of hedge obligation $ 25,000   $ 25,000    
Fixed interest rate of derivative (as a percent) 2.34%   2.34%