Income Taxes (Schedule Of Income Tax Expense From Continuing Operations Percentage) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	35.00%
State taxes, net of federal benefit	1.40%	0.90%	1.00%
Tax effect of foreign operations	(1.60%)	(0.70%)	(8.80%)
Global intangible low-taxed income	2.20%	0.70%	0.00%
Current and deferred foreign withholding taxes	1.20%	3.80%	3.50%
Deemed repatriation of foreign earnings	0	(0.003)	0.156
Deferred tax revaluation	(0.10%)	(0.10%)	(6.00%)
Stock-based compensation	(1.10%)	(0.80%)	(2.00%)
Tax benefit for outside basis in subsidiary	0	0	(0.018)
Change in valuation allowance	0.40%	(2.00%)	(0.40%)
Change in uncertain tax positions, net	(0.30%)	(0.30%)	(0.60%)
Domestic production activities deduction	0.00%	0.00%	(1.20%)
Other permanent differences, net	(0.30%)	(1.40%)	(1.60%)
Other, net	(0.40%)	(0.40%)	(0.70%)
Effective tax rate	22.40%	20.40%	32.00%