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Income Taxes (Reconciliation Of The Statutory Federal Income Tax Rate To The Effective Tax Rate) (Details) |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Statutory federal income tax rate | 21.00% | 21.00% | 21.00% | 35.00%
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |
State income taxes (net of federal income tax benefit) |  | 0.80% | 0.90% | 0.80%
Foreign rate differential |  | (1.40%) | (0.90%) | (12.70%)
Resolution and expiration of statutes of limitation of uncertain tax positions |  | (2.10%) | (1.70%) | (7.20%)
Permanent foreign exchange losses |  | 0.00% | 0.00% | (0.80%)
Research credits, uncertain tax positions and other |  | 8.10% | (0.70%) | (0.50%)
TCJA - revaluation of U.S. deferred income taxes |  | 0.00% | (1.60%) | (47.90%)
TCJA - Transition Tax |  | 0.00% | 1.80% | 47.90%
Effective income tax rate |  | 26.40% | 18.80% | 14.60%

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