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Share-based Compensation (Details 3) (RSUs, USD $)
3 Months Ended
Mar. 26, 2013
Mar. 27, 2012
Share-based compensation    
Unrecognized compensation cost of unvested stock awards (in dollars) $ 6,200,000  
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards 1 year 2 months 12 days  
Restricted Stock Units, Shares    
Outstanding at the beginning of the period (in shares) 1,803,514  
Granted (in shares) 142,647  
Forfeited (in shares) (5,967)  
Vested (in shares) (546,175)  
Outstanding at the end of period (in shares) 1,394,019  
Restricted Stock Units, Weighted-Average Grant Date Fair Value    
Outstanding at the beginning of the period (in dollars per share) $ 15.73  
Granted (in dollars per share) $ 19.00  
Forfeited (in dollars per share) $ 16.95  
Vested (in dollars per share) $ 15.67  
Outstanding at the end of the period (in dollars per share) $ 16.08  
Intrinsic value of vested awards (in dollars) 9,900,000 4,800,000
Weighted-Average Remaining Contractual Term (years)    
Weighted-Average Remaining Contractual Term 8 years 9 months 25 days  
Aggregate Intrinsic Value    
Outstanding at the end of the period (in dollars) $ 28,048,000  
Maximum
   
Share-based compensation    
Vesting period 5 years  
Minimum
   
Share-based compensation    
Vesting period 1 year