Income Taxes - Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory U.S. federal tax rate	21.00%	35.00%	35.00%
Net difference resulting from:
Research and development tax credit	(5.00%)	(4.00%)	(4.00%)
Foreign earnings subject to different tax rates	3.00%	(2.00%)	(3.00%)
Nondeductible expenses	1.00%	1.00%	0.00%
State income taxes	2.00%	2.00%	2.00%
Foreign tax credits	(4.00%)	(1.00%)	(1.00%)
Foreign withholding taxes	1.00%	1.00%	0.00%
Effect of US Law Change	(1.00%)	12.00%	0.00%
Global Intangible Low-Taxed Income (GILTI)	5.00%	0.00%	0.00%
Stock Based Compensation - Excess Tax Benefit	(4.00%)	(5.00%)	0.00%
Other	0.00%	(1.00%)	(1.00%)
Total difference	(2.00%)	3.00%	(7.00%)
Effective income tax rate	19.00%	38.00%	28.00%

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Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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