Income Taxes (Reconciliation Of Effective Tax Rate, By Percentage) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Tax at U.S. statutory rate	21.00%	35.00%
Surtax exemption		(0.20%)
State income taxes, net of federal benefit	(0.60%)	0.50%
Foreign income taxes, net of foreign tax credits	(4.40%)	(12.80%)
Other nondeductible items	(0.60%)	(1.00%)
Effect of increase in uncertain tax positions	(0.30%)	1.50%
Change in valuation allowance	(20.30%)	3.10%
Change in federal deferred tax rate		(25.70%)
Expense of prior year tax receivable	(3.90%)
Other	2.80%	(0.10%)
Effective tax rate	(6.30%)	0.30%