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Income Taxes Income Taxes (Table 3) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential | (0.10%) | (0.70%) | (4.50%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount | (3.40%) | (2.10%) | (2.20%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes | 2.30% | 2.40% | 2.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense | 0.70% | 0.10% | 0.50%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 0.00% | 2.00% | (4.40%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance | 0.00% | 3.80% | 2.70%
Effective Income Tax Rate Reconciliation, Deductions, Other | 1.30% | (0.10%) | 1.80%

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