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Share-based Compensation (Restricted Stock) (Details) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2015
Sep. 30, 2014
Sep. 29, 2015
Sep. 30, 2014
Restricted Stock Units, Shares        
Outstanding at the beginning of the period (in shares)     978,124  
Granted (in shares)     648,152  
Forfeited (in shares)     (30,292)  
Vested (in shares)     (622,290)  
Outstanding at the end of period (in shares) 973,694   973,694  
Restricted Stock Units, Weighted-Average Grant Date Fair Value        
Outstanding at the beginning of the period (in dollars per share)     $ 22.52  
Granted (in dollars per share)     35.86  
Forfeited (in dollars per share)     27.30  
Vested (in dollars per share)     20.69  
Outstanding at the end of the period (in dollars per share) $ 32.42   $ 32.42  
Weighted-Average Remaining Contractual Term (years)        
Weighted-Average Remaining Contractual Term     1 year 3 months 18 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars) $ 36,105   $ 36,105  
Intrinsic value of awards vested (in dollars) 4,400 $ 3,100 21,900 $ 17,300
Unrecognized compensation cost        
Unrecognized compensation cost of unvested stock awards (in dollars) $ 19,100   $ 19,100  
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards     1 year 3 months 18 days  
Minimum        
Share-based compensation        
Vesting period     1 year  
Maximum        
Share-based compensation        
Vesting period     5 years