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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Statutory income tax benefit (34.00%) (34.00%) (34.00%)
Foreign taxes 1.70% 8.80% 1.40%
State income taxes, net of federal income taxes (2.30%) (2.80%) 0.30%
Income Tax credits (5.00%) (5.50%) (3.30%)
Incentive Stock options 5.50% 0.60% 0.50%
Change in effective state rate (1.50%) (0.30%) 0.10%
Undistributed earnings of foreign subsidiaries   (1.00%) 8.40%
Impairment of goodwill     24.80%
Translation loss (6.90%)    
Impact of tax reform (105.70%)    
Other 3.30% 4.00% (1.10%)
Change in valuation allowance 56.60% 38.20% 120.90%
Income tax expense (benefit) (88.30%) 8.00% 118.00%