Income Taxes (Schedule Of Effective Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Tax provision based on the federal statutory rate	35.00%	35.00%	35.00%
Nondeductible expenses	(0.10%)	12.50%
Uncertain tax positions	(0.50%)	11.20%
Deemed income related to foreign operations	(0.60%)	8.10%	0.20%
Return to provision adjustments, foreign current and deferred balances	(0.70%)	2.50%	(0.40%)
Foreign income tax rate differential	(2.00%)	0.50%	(0.30%)
State taxes, net of federal benefit, before valuation allowance	0.90%	0.30%	2.40%
Increase in valuation allowances	(16.40%)
Impairment of goodwill with no tax basis	(16.80%)
Foreign tax credits related to above	0.20%	(6.30%)
Domestic production activities deduction		(12.00%)	(3.60%)
Research credits		(21.90%)	(0.60%)
Other	(0.40%)	1.40%	(1.60%)
Effective tax rate	(1.40%)	31.30%	31.10%