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Share-based Compensation (Details 2) - Restricted Stock Units - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jul. 01, 2014
Jun. 30, 2015
Jul. 01, 2014
Restricted Stock Units, Shares        
Outstanding at the beginning of the period (in shares)     978,124  
Granted (in shares)     538,568  
Forfeited (in shares)     (21,910)  
Vested (in shares)     (506,980)  
Outstanding at the end of period (in shares) 987,802   987,802  
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)     35.30  
Forfeited (in dollars per share)     26.43  
Vested (in dollars per share)     19.79  
Outstanding at the end of the period (in dollars per share) $ 30.80   $ 30.80  
Weighted-Average Remaining Contractual Term (years)        
Weighted-Average Remaining Contractual Term     1 year 4 months 24 days  
Aggregate Intrinsic Value        
Outstanding at the end of the period (in dollars) $ 36,973   $ 36,973  
Intrinsic value of awards vested (in dollars) 4,000 $ 2,700 17,400 $ 14,200
Unrecognized compensation cost        
Unrecognized compensation cost of unvested stock awards (in dollars) $ 21,600   $ 21,600  
Expected weighted-average period of recognition of unrecognized compensation cost of unvested awards     1 year 4 months 24 days  
Minimum        
Share-based compensation        
Vesting period     1 year  
Maximum        
Share-based compensation        
Vesting period     5 years