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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 25, 2013
Dec. 25, 2012
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 (3,138) (4,016)
Fair value measured on a recurring basis | Level 1
   
Fair value of financial instruments    
Deferred compensation plan - assets 10,603 9,145
Deferred compensation plan - liabilities (10,612) (9,160)
Fair value measured on a recurring basis | Level 2
   
Fair value of financial instruments    
Interest rate swaps $ (3,138) $ (4,016)