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Income Taxes (Schedule of Reconciliation of Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Statutory tax rate 23.00% 24.00% 25.00%
Approved and Beneficiary Enterprises benefits 16.00% 15.70% 7.00%
US Tax Act enactment (222.50%)
Stock compensation expense (24.00%) (5.30%) (2.40%)
Tax contingencies (38.40%) (30.80%) (4.70%)
Non-deductible acquisition expenses (2.30%) (0.60%) (0.20%)
Earning taxed under foreign law (21.60%) 43.30% 34.40%
Valuation allowance 6.40% 144.40% (57.00%)
Changes to the prior year's tax assessment (15.30%) (1.20%) 7.90%
Other (1.40%) 1.50% 0.90%
Effective income tax rate (57.60%) (31.50%) 10.90%