Income Taxes Income Taxes (Reconciliation Of Statutory Federal Income Tax Rate With Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
U.S. federal statutory rate	21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	1.20%	0.80%	1.10%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(7.70%)	(16.10%)	(14.60%)
Effective Income Tax Rate Reconciliation Subpart F Income	1.50%	7.20%	9.40%
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent	(1.40%)	(6.20%)	(5.50%)
Effective Income Tax Rate Reconciliation, Tax Contingencies, Reserve	4.10%	3.90%	4.70%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	0.20%	(0.90%)	(1.00%)
Effective Income Tax Rate Reconciliation, Deductions, Qualified Production Activities	(0.00%)	(1.60%)	(1.10%)
Tax Cuts and Jobs Act of 2017, Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	0.00%	(16.10%)	0.00%
Effective Income Tax Rate Reconciliation, Contingent Liabilities	2.40%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Unrecognized Loss on Intercompany Sale	1.90%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments	2.00%	(0.30%)	(0.10%)
Effective Income Tax Rate, Continuing Operations	25.20%	30.30%	27.90%