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Share-based Compensation (Details 2) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 24, 2013
Sep. 30, 2014
Sep. 24, 2013
Shares        
Exercised (in shares)     (260,515)  
Stock Options
        
Shares        
Outstanding at the beginning of the period (in shares)     1,043,438  
Exercised (in shares)     (260,515)  
Outstanding at the end of the period (in shares) 781,697   781,697  
Exercisable at the end of period (in shares) 781,697   781,697  
Forfeited (in shares)     (1,226)  
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share)     $ 13.77  
Exercised (in dollars per share)     $ 12.31  
Outstanding at the end of the period (in dollars per share) $ 14.26   $ 14.26  
Exercisable at the end of the period (in dollars per share) $ 14.26   $ 14.26  
Forfeited (in dollars per share)     $ 14.82  
Weighted-Average Remaining Contractual Term        
Outstanding at the end of the period     1 year 9 months 18 days  
Exercisable at the end of the period     1 year 9 months 18 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars) $ 10,616,000   $ 10,616,000  
Exercisable at the end of the period (in dollars) 10,616,000   10,616,000  
Intrinsic value of options exercised (in dollars) $ 1,300,000 $ 1,700,000 $ 3,600,000 $ 8,000,000
Awards vested (in shares) 0 0 0 0