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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 01, 2014
Jul. 01, 2014
Jun. 25, 2013
Dec. 31, 2013
Fair Value Measurements        
Transfer of asset levels within the fair value hierarchy $ 0 $ 0    
Transfer of liability levels within the fair value hierarchy 0 0    
Fair value of financial instruments        
Interest rate swaps (2,082) (2,082)   (2,696)
Purchase price of land and building sold 1,193 1,193 4  
Fair value measured on a recurring basis | Level 2
       
Fair value of financial instruments        
Interest rate swaps (2,082) (2,082)   (2,696)
Fair value measured on a recurring basis | Level 1
       
Fair value of financial instruments        
Deferred compensation plan - assets 13,712 13,712   11,916
Deferred compensation plan - liabilities (13,698) (13,698)   (11,913)
Fair value measured on a nonrecurring basis | Level 2
       
Fair value of financial instruments        
Long-lived assets       1,203
Total losses   $ 15