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Share-based Compensation (PSU and Options) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2015
USD ($)
item
$ / shares
shares
Sep. 30, 2014
USD ($)
Sep. 29, 2015
USD ($)
item
$ / shares
shares
Sep. 30, 2014
USD ($)
shares
Options        
Shares        
Outstanding at the beginning of the period (in shares)     636,930  
Forfeited (in shares)     (2,286)  
Exercised (in shares)     (272,594)  
Outstanding at the end of the period (in shares) 362,050   362,050  
Exercisable at the end of period (in shares) 362,050   362,050  
Stock options vested (in shares)     0 0
Weighted-Average Exercise Price        
Outstanding at the beginning of the period (in dollars per share) | $ / shares     $ 14.20  
Forfeited (in dollars per share) | $ / shares     17.94  
Exercised (in dollars per share) | $ / shares     15.38  
Outstanding at the end of the period (in dollars per share) | $ / shares $ 13.28   13.28  
Exercisable at the end of the period (in dollars per share) | $ / shares $ 13.28   $ 13.28  
Weighted-Average Remaining Contractual Term        
Outstanding at the end of the period     1 year 4 months 24 days  
Exercisable at the end of the period     1 year 4 months 24 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars) | $ $ 8,616   $ 8,616  
Exercisable at the end of the period (in dollars) | $ 8,616   8,616  
Intrinsic value of options exercised (in dollars) | $ $ 2,300 $ 1,300 $ 5,900 $ 3,600
PSUs        
Share-based compensation        
Number of executives to whom the stock awards are granted | item 2   2  
Vesting period     1 year  
Granted (in shares)     115,000  
Granted (in dollars per share) | $ / shares     $ 34.77  
Unrecognized compensation cost of unvested stock awards (in dollars) | $ $ 1,100   $ 1,100  
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards     3 months 18 days