Income Taxes Income Taxes - Unrecognized Tax Benefits - Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefit, beginning of year	$ 15,635	$ 9,445	$ 12,275
Gross increases for tax positions of prior years	12,939	1,233	493
Gross decrease for tax positions of prior years	(395)	(4)	(6,331)
Gross increases for tax positions of current year	20,863	4,961	3,008
Unrecognized tax benefit, end of year	$ 49,042	$ 15,635	$ 9,445

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

+ References

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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