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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended
Jul. 01, 2014
Sep. 30, 2014
Sep. 24, 2013
Sep. 30, 2014
Fair value measured on a recurring basis
Level 2
Dec. 31, 2013
Fair value measured on a recurring basis
Level 2
Sep. 30, 2014
Fair value measured on a recurring basis
Level 1
Dec. 31, 2013
Fair value measured on a recurring basis
Level 1
Sep. 30, 2014
Fair value measured on a nonrecurring basis
Level 2
Dec. 31, 2013
Fair value measured on a nonrecurring basis
Level 2
Fair Value Measurement                  
Transfer of asset levels within the fair value hierarchy   $ 0              
Transfer of liability levels within the fair value hierarchy   0              
Fair value of financial instruments                  
Interest rate swaps       (1,711) (2,696)        
Deferred compensation plan - assets           14,342 11,916    
Deferred compensation plan - liabilities           (14,330) (11,913)    
Long-lived assets                 1,203
Total losses               15  
Purchase price of land and building sold $ 1,200 $ 1,197 $ (39)