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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Statutory income tax (benefit) expense 21.00% 21.00% (34.00%)
Foreign taxes 0.20% (0.90%) 1.70%
State income taxes, net of federal income taxes 1.90% 3.40% (2.30%)
Income Tax credits (5.60%) (6.80%) (5.00%)
Incentive Stock options (3.70%) 1.30% 5.50%
Change in effective state rate (0.10%) 0.30% (1.50%)
Deferred tax asset write-off 31.40% 21.70%  
Translation loss     (6.90%)
Impact of tax reform     (105.70%)
Other 0.70% 1.10% 3.30%
Change in valuation allowance (135.90%) (53.90%) 56.60%
Income tax expense (benefit) (90.10%) (12.80%) (88.30%)