Restructuring And Cost Reduction Programs (Summary of Charges Associated with Restructuring Programs by Major Type of Charges) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost And Reserve [Line Items]
Total expected restructuring charges	$ 7,576
Restructuring charges	10,955	$ 7,116	$ 6,957
Cumulative restructuring charges incurred	77,313
Global Optimization Program [Member]
Restructuring Cost And Reserve [Line Items]
Total expected restructuring charges	7,576
Restructuring charges	10,955	7,116	6,957
Cumulative restructuring charges incurred	77,313
Employee Severance [Member]
Restructuring Cost And Reserve [Line Items]
Total expected restructuring charges	7,500
Restructuring charges	7,163	3,560	3,701
Cumulative restructuring charges incurred	44,251
Employee Severance [Member] | Global Optimization Program [Member]
Restructuring Cost And Reserve [Line Items]
Total expected restructuring charges	7,500
Restructuring charges	7,163	3,560	3,701
Cumulative restructuring charges incurred	44,251
Other Costs [Member]
Restructuring Cost And Reserve [Line Items]
Total expected restructuring charges	76
Restructuring charges	3,792	3,556	3,256
Cumulative restructuring charges incurred	33,062
Other Costs [Member] | Global Optimization Program [Member]
Restructuring Cost And Reserve [Line Items]
Total expected restructuring charges	76
Restructuring charges	3,792	$ 3,556	$ 3,256
Cumulative restructuring charges incurred	$ 33,062