Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Computed "expected" income tax expense (benefit)	(34.00%)	(34.00%)	(34.00%)
Foreign taxes	1.40%	0.60%	4.20%
State income taxes, net of federal income taxes	0.30%	(1.70%)	(0.70%)
Income Tax credits	(3.30%)	(0.90%)	(3.70%)
Incentive Stock options	0.50%	0.40%	0.90%
Change in effective state rate	0.10%	1.00%
Foreign sourced unearned income		1.70%
Undistributed earnings of foreign subsidiaries	8.40%	3.50%
Impairment of goodwill	24.80%
Other	(1.10%)	(0.20%)	0.50%
Decrease in valuation allowance	117.00%	1.20%
Income tax benefit	114.10%	(28.40%)	(32.80%)