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Income Taxes Income Taxes (Table 3) (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate 21.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential (0.71%) (4.50%) (5.30%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount (2.10%) (2.20%) (3.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes 2.40% 2.00% 2.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense 0.10% 0.50% 0.20%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent 2.00% (4.40%) 0.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance 3.80% 2.70% 0.00%
Effective Income Tax Rate Reconciliation, Deductions, Other (0.10%) 1.80% 0.20%
Effective Income Tax Rate, Continuing Operations 26.40% 30.90% 29.10%