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Income Taxes (Details 3)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Statutory rates 34.00% 34.00% 34.00%
State and local taxes, net of Federal benefit 0.20% 0.30% 0.20%
Deferred tax effect of statutory tax rate changes 1.40%
Foreign income tax recovery (4.60%)
Effect of foreign taxes greater than (less than) U.S. statutory rates (1.00%) 1.50% 1.60%
Other (0.80%) (0.30%) (0.20%)
Effective rates 29.20% 35.50% 35.60%