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, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Tax at U.S. statutory rate 35.00% 35.00% 35.00%
Surtax exemption (0.60%) (1.10%) (0.70%)
State income taxes, net of federal benefit 0.20% 0.60% 1.00%
Foreign income taxes, net of foreign tax credits (7.20%) (3.60%) 7.80%
Other nondeductible items (0.90%) 0.00% 3.10%
Effect of (decrease) increase in uncertain tax positions 0.00% (1.40%) (10.20%)
Federal credits   15.10%  
Change in valuation allowance (30.10%) (35.20%)  
Other 0.30% (2.20%) 2.30%
Effective tax rate (3.30%) 7.20% 38.30%