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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 01, 2014
Dec. 31, 2013
Fair Value Measurements    
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 (2,402) (2,696)
Fair value measured on a recurring basis | Level 2
   
Fair value of financial instruments    
Interest rate swaps (2,402) (2,696)
Fair value measured on a recurring basis | Level 1
   
Fair value of financial instruments    
Deferred compensation plan - assets 12,708 11,916
Deferred compensation plan - liabilities $ (12,708) $ (11,913)