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Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Statutory income tax benefit (34.00%) (34.00%) (34.00%)
Foreign taxes 8.80% 1.40% 0.60%
State income taxes, net of federal income taxes (2.80%) 0.30% (1.70%)
Income Tax credits (5.50%) (3.30%) (0.90%)
Incentive Stock options 0.60% 0.50% 0.40%
Change in effective state rate (0.30%) 0.10% 1.00%
Foreign sourced unearned income     1.70%
Undistributed earnings of foreign subsidiaries (1.00%) 8.40% 3.50%
Impairment of goodwill   24.80%  
Other 4.00% (1.10%) (0.20%)
Change in valuation allowance 38.20% 120.90% 1.20%
Income tax expense (benefit) 8.00% 118.00% (28.40%)