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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Tax provision at statutory rate based on income before income taxes (percent) | 21.00% | 35.00% | 35.00%
Effective Income Tax Rate Reconciliation Tax Reform, Domestic | 1.80% | (111.00%) | 0.00%
Effective Income Tax Rate Reconciliation Tax Reform, International | (3.60%) | (0.00%) | (0.00%)
Effective Income Tax Rate Reconciliation, Consolidated Group Restructuring | 0.00% | (7.40%) | 0.00%
Foreign income taxes (percent) | 3.60% | (5.30%) | (6.80%)
Federal research credit (percent) | (2.80%) | (2.80%) | (5.60%)
Settlement of taxing authority examinations (percent) | (0.70%) | (2.10%) | (3.50%)
Stock-based compensation (percent) | (1.60%) | (2.10%) | (0.00%)
European permanent deduction (percent) | (0.20%) | (0.50%) | (3.40%)
Non deductible/non-taxable items (percent) | (1.20%) | (0.50%) | 7.20%
State income taxes, net of federal tax benefit (percent) | 1.60% | 2.80% | 1.70%
Effective Income Tax Rate Reconciliation, US tax on worldwide earnings at different rates, Percent | 2.90% | 0.00% | 0.00%
Other, net (percent) | (1.50%) | 0.80% | (0.30%)
Effective income tax rate, continuing operations (percent) | 19.30% | (93.10%) | 24.30%

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- Definition Percentage of reported income tax expense (benefit) attributable to the Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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