Income Taxes (Reconciliation Of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory income tax rate	19.00%	19.00%	19.30%
Foreign earnings subject to different tax rates	0.30%	(9.70%)	18.20%
Net change in unrecognized tax benefits	1.30%	(0.70%)	4.30%
Adjustments on prior year taxes	(0.40%)	(0.70%)	(4.40%)
Change in valuation allowance	(8.80%)	(14.40%)	19.30%
Deferred tax asset/liability revaluation for tax rate change	(0.50%)	(1.70%)	1.40%
U.S. transition tax	0.00%	(0.80%)	17.10%
Impairments	(21.90%)	(16.50%)	0.00%
Non-deductible legal provision	(0.80%)	(3.80%)	0.00%
Other	(1.10%)	0.90%	5.10%
Effective income tax rate	(12.90%)	(28.40%)	80.30%