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Income Taxes - Reconciliation Of Provision Of Income Taxes (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	21.00%
State income taxes (net of federal income tax benefit)	1.60%	1.40%	2.20%
Foreign income tax rate differential	3.30%	0.80%	1.10%
Revaluation of deferred tax assets for foreign and state tax rate changes, net	(1.90%)	(1.00%)	(1.30%)
Loss on sale of subsidiary	(2.30%)	0.00%	0.00%
Legal settlement	(5.10%)	0.00%	0.00%
Purchase accounting adjustments	4.30%	0.00%	0.00%
Research and development credit	0.00%	(0.50%)	(0.20%)
Tax reserves	(0.10%)	0.80%	2.00%
Withholding taxes	(0.10%)	0.70%	0.20%
2017 Tax Act	0	0	(0.002)
Change in valuation allowance	(13.50%)	3.10%	4.50%
Nondeductible expenses	(1.60%)	2.30%	1.40%
Incremental tax benefit from share-based compensation awards	0.20%	(2.00%)	(1.70%)
GILTI	0.00%	0.50%	0.80%
Other	1.00%	1.20%	(0.90%)
Effective tax rate	6.80%	28.30%	28.90%

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- Definition

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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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