Annual report pursuant to Section 13 and 15(d)

Income Taxes (Reconciliation Of Effective Tax Rate, By Percentage) (Details)

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Income Taxes (Reconciliation Of Effective Tax Rate, By Percentage) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Tax at U.S. statutory rate 35.00% 35.00%
Surtax exemption (0.20%) (0.60%)
State income taxes, net of federal benefit 0.50% 0.20%
Foreign income taxes, net of foreign tax credits (12.80%) (7.20%)
Other nondeductible items (1.00%) (0.90%)
Effect of increase in uncertain tax positions 1.50% 0.00%
Change in valuation allowance 3.10% (30.10%)
Change in federal deferred tax rate (25.70%)  
Other (0.10%) 0.30%
Effective tax rate 0.30% (3.30%)