Income Taxes - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefit as of January 1	$ 49,085	$ 22,827	$ 19,657
Gross decreases - acquisitions	(24,963)
Gross increases-acquisitions		26,914	0
Gross increases-tax positions in prior period	1,572	207	1,229
Gross decreases-tax positions in prior period	0	(1,743)	(376)
Gross increases-tax positions in current period	1,281	3,563	4,014
Reductions due to a lapse of the applicable statute of limitations	(3,502)	(2,230)	(994)
Changes due to currency fluctuation		(453)	(703)
Changes due to currency fluctuation	994
Settlements	(392)	0	0
Unrecognized tax benefit as of December 31	$ 24,075	$ 49,085	$ 22,827

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

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Amount of unrecognized tax benefits.

+ References

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Amount of decrease in unrecognized tax benefits resulting from acquisitions.

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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 acquisitions.

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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.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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