Income Taxes (Schedule Of Income Tax Expense From Continuing Operations Percentage) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
State taxes, net of federal benefit	0.90%	0.90%	0.90%
Tax effect of foreign operations	0.00%	(8.80%)	(6.40%)
Current and deferred foreign withholding taxes	3.80%	3.60%	0.90%
Deemed repatriation of foreign earnings	(0.003)	0.156	0.000
Deferred tax revaluation	(0.10%)	(6.00%)	0.00%
Stock-based compensation	(0.80%)	(2.00%)	(3.40%)
Tax benefit for outside basis in subsidiary	0.000	(0.018)	0.000
Change in valuation allowance	(2.00%)	(0.40%)	0.20%
Change in uncertain tax positions, net	(0.30%)	(0.60%)	(0.60%)
Domestic production activities deduction	(0.00%)	(1.20%)	(1.20%)
Other permanent differences, net	(1.40%)	(1.60%)	(0.60%)
Other, net	(0.40%)	(0.70%)	(0.20%)
Effective tax rate	20.40%	32.00%	24.60%