Income Taxes (Schedule Of Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Tax provision based on the federal statutory rate	35.00%	35.00%	35.00%
Increase in valuation allowances	48.80%	(58.50%)	(16.40%)
Other	2.90%	1.70%	(0.40%)
Foreign tax rate change	2.20%
Return to provision adjustments	2.00%	18.80%	(0.70%)
State taxes, net of federal benefit, before valuation allowance	1.00%	3.90%	0.90%
Deferred tax adjustments	(1.10%)	13.00%
Uncertain tax positions	(1.40%)	(25.10%)	(0.50%)
Nondeductible expenses	(3.30%)	(1.10%)	(0.10%)
Deemed income related to foreign operations	(4.10%)	(8.40%)	(0.60%)
Employee share-based payments	(13.20%)
One-Time transition tax	(16.50%)
U.S. Tax Cuts and Jobs Act - rate change	(65.90%)
Foreign exchange loss		9.40%
Impairment of definite lived intangibles		3.10%
Foreign income tax rate differential		3.10%	(2.00%)
Impairment of goodwill with no tax basis			(16.80%)
Foreign tax credits related to above		6.50%	0.20%
Effective tax rate	(13.60%)	1.40%	(1.40%)