Income Taxes (Reconciliation Of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory income tax rate	19.30%	34.40%	38.00%
Foreign earnings subject to different tax rates	18.20%	(18.50%)	28.40%
Net change in unrecognized tax benefits	4.30%	3.00%
Adjustments on prior year taxes	(4.40%)	2.40%	(11.00%)
Change in valuation allowance	19.30%	13.10%	36.90%
Deferred tax asset/liability revaluation for tax rate change	1.40%	(0.80%)	1.80%
U.S. transition tax	17.10%
Other	5.10%	(0.90%)	(3.50%)
Effective income tax rate	80.30%	32.70%	90.60%