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Income Taxes (Reconciliation of Income Tax Provision) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes      
U.S. statutory rate applied to income before income taxes 21.00% 35.00% 35.00%
State income taxes, net of federal tax benefit 3.70% 1.10% 1.80%
Statutory rates other than U.S. statutory rate 0.20% (3.10%) (2.70%)
Routine tax incentives (5.40%) (2.70%) (4.00%)
Net tax (benefit) cost on foreign income 1.40% (0.70%) 0.10%
Net impact of the Tax Act 6.40% (2.50%) 0.00%
Valuation allowance 1.60% (0.10%) 0.20%
Other - net [1] (2.90%) (1.10%) 0.20%
Effective income tax rate 26.00% 25.90% 30.60%
[1] Other - net is composed of numerous items, none of which is greater than 1.05 percent and 1.75 percent of income before income taxes in 2018 and 2017- 2016, respectively.