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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 30, 2014
Fair value of financial instruments    
Transfer of asset levels within the fair value hierarchy $ 0  
Transfer of liability levels within the fair value hierarchy 0  
Fair value measured on a recurring basis | Level 2    
Fair value of financial instruments    
Interest rate swaps (697) $ (1,375)
Fair value measured on a recurring basis | Level 1    
Fair value of financial instruments    
Deferred compensation plan - assets 16,937 14,963
Deferred compensation plan - liabilities $ (16,960) $ (14,974)