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Share-based Compensation (Details 3)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
item
$ / shares
shares
Jul. 01, 2014
USD ($)
Jun. 30, 2015
USD ($)
item
$ / shares
shares
Jul. 01, 2014
USD ($)
shares
Options        
Shares        
Outstanding at the beginning of the period (in shares)     636,930  
Exercised (in shares)     (173,223)  
Outstanding at the end of the period (in shares) 463,707   463,707  
Exercisable at the end of period (in shares) 463,707   463,707  
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  
Exercised (in dollars per share) | $ / shares     15.54  
Outstanding at the end of the period (in dollars per share) | $ / shares $ 13.69   13.69  
Exercisable at the end of the period (in dollars per share) | $ / shares $ 13.69   $ 13.69  
Weighted-Average Remaining Contractual Term        
Outstanding at the end of the period     1 year 7 months 6 days  
Exercisable at the end of the period     1 year 7 months 6 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars) | $ $ 11,007   $ 11,007  
Exercisable at the end of the period (in dollars) | $ 11,007   11,007  
Intrinsic value of options exercised (in dollars) | $ $ 1,300 $ 800 $ 3,600 $ 2,300
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) | $ $ 2,100   $ 2,100  
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards     6 months