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Share Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 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   $ 7,842 $ 7,522 $ 16,409 $ 15,079
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted       664,686 1,557,681
Weighted average exercise price       $ 67.27 $ 72.76
Weighted average fair value per option       $ 14.86 $ 14.68
Total unrecognized compensation expense $ 18,800 18,800   $ 18,800  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 10 months 10 days        
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted       298,249 82,835
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock units granted       39,330 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       $ 63.37 $ 66.70
Total unrecognized compensation expense $ 18,500 $ 18,500   $ 18,500  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 4 months 21 days