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Stock-based Compensation Plans (Stock-based compensation expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 4,553 $ 5,165 $ 13,541 $ 15,948
Stock options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 1,316 1,533 3,888 5,059
Restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense 2,389 2,323 6,548 7,110
Performance-based share units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Compensation expense $ 848 $ 1,309 $ 3,105 $ 3,779