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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] |  |  |
Tax provision at statutory rate based on income before income taxes (percent) | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation Tax Reform, Domestic | 0.00% | 1.80% | (111.00%)
Effective Income Tax Rate Reconciliation Tax Reform, International | 0.00% | (3.60%) | 0.00%
Effective Income Tax Rate Reconciliation, Consolidated Group Restructuring | 0.00% | 0.00% | (7.40%)
Foreign income taxes (percent) | 6.40% | 3.60% | (5.30%)
Federal research credit (percent) | (4.00%) | (2.80%) | (2.80%)
Effective Income Tax Rate Reconciliation, Tax treaty protocols, Percent | (2.90%) | 0.00% | 0.00%
Settlement of taxing authority examinations (percent) | (7.70%) | (0.70%) | (2.10%)
Stock-based compensation (percent) | (15.40%) | (1.60%) | (2.10%)
Non deductible/non-taxable items (percent) | 2.80% | (1.40%) | (1.00%)
State income taxes, net of federal tax benefit (percent) | 0.30% | 1.60% | 2.80%
Effective Income Tax Rate Reconciliation, US tax on worldwide earnings at different rates, Percent | 7.90% | 2.90% | 0.00%
Other, net (percent) | (0.10%) | (1.50%) | 0.80%
Effective income tax rate, continuing operations (percent) | 8.30% | 19.30% | (93.10%)

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