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Income Taxes (Schedule Of Effective Income Tax Rate For Continuing Operations) (Details)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]    
Income tax expense at federal statutory rate 35.00% 35.00%
State taxes, net of federal income tax benefit 1.30% 0.70%
Income tax contingency accruals and tax settlements (0.40%) 1.30%
Unremitted earnings from foreign operations 0.20% (1.10%)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount (0.60%) (23.80%)
Changes in estimates related to prior year tax provision 0.50% (1.60%)
Effective Income Tax Rate Reconciliation Deduction For Foreign Investment Adjustments (3.50%) 0.10%
Non-deductible expenses 0.50% 1.60%
Valuation allowance for foreign operating loss carry-forwards 0.40% 0.30%
Research and development tax credit (0.70%) (1.80%)
Foreign rate differences 1.50% 1.10%
Valuation allowance for capital loss carry-forwards 0.00% (0.40%)
Domestic production activities deduction (0.90%) (3.80%)
Effective income tax rate for income from continuing operations 14.70% 7.60%