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Share Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2018
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant under the 2018 Plan 12,562,318 12,562,318   12,562,318  
Share-based compensation expense   $ 6,378 $ 7,852 $ 22,787 $ 22,931
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted       691,086 1,619,280
Weighted average exercise price       $ 67.72 $ 72.16
Weighted average fair value per option       $ 14.99 $ 14.57
Total unrecognized compensation expense $ 15,500 15,500   $ 15,500  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 8 months 19 days        
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted       306,338 85,049
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted       41,310 0
Restricted Stock Units and Performance-Based Restricted Share Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average fair value per share       $ 63.73 $ 66.34
Total unrecognized compensation expense $ 17,000 $ 17,000   $ 17,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 2 months 27 days