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Income Taxes - Reconciliation of Effective Income Tax Rate (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of Effective Income Tax Rate |  |  |
Statutory U.S. tax rate | 21.00% | 35.00% | 35.00%
State income taxes--net of federal benefit | 1.00% | 0.80% | 0.90%
International income taxes - net | 0.20% | (6.30%) | (2.70%)
Global Intangible Low Taxed Income (GILTI) | 1.10% |  |
Foreign Derived Intangible Income (FDII) | (1.30%) |  |
U.S. TCJA enactment - net impacts | 2.50% | 10.10% |
U.S. research and development credit | (1.50%) | (0.70%) | (0.50%)
Reserves for tax contingencies | 1.20% | 2.20% | 0.20%
Domestic Manufacturer’s deduction |  | (1.80%) | (1.80%)
Employee share-based payments | (1.40%) | (3.20%) | (2.80%)
All other--net | 0.60% | (0.60%) |
Effective worldwide tax rate (as a percent) | 23.40% | 35.50% | 28.30%

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- Definition Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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