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Income Taxes (Schedule of Reconciliation of U.S. Statutory Income Tax Rate to Company's Effective Income Tax Rate from Continuing Operations) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
United States federal statutory rate 35.00% 35.00% 35.00%
United States state and local income taxes, less federal deduction 1.20% 1.70% 2.10%
International operations (21.00%) (22.20%) (17.60%)
Tax Cuts and Jobs Act of 2017 transition tax 38.00% 0.00% 0.00%
Tax Cuts and Jobs Act of 2017 deferred tax changes 2.30% 0.00% 0.00%
Tax related to repatriation of foreign earnings (0.00%) (0.30%) (3.90%)
Other (4.90%) 0.10% 1.50%
Effective income tax rate, total 50.60% 14.30% 17.10%