Income Taxes Income Taxes (Reconciliation Of Statutory Federal Income Tax Rate With Effective Income Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
U.S. federal statutory rate	35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes	1.10%	0.30%	0.60%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential	(14.60%)	(15.80%)	(13.80%)
Effective Income Tax Rate Reconciliation Subpart F Income	9.40%	5.40%	5.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent	(5.50%)	(6.10%)	(6.40%)
Effective Income Tax Rate Reconciliation, Tax Contingencies, Reserve	4.70%	(3.30%)	(2.20%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance	(1.00%)	1.80%	2.60%
Effective Income Tax Rate Reconciliation, Deductions, Qualified Production Activities	(1.10%)	(1.20%)	(0.50%)
Effective Income Tax Rate Reconciliation, Other Adjustments	(0.10%)	(1.30%)	(1.90%)
Effective Income Tax Rate, Continuing Operations	27.90%	14.80%	19.20%