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Income Taxes - Reconciliation of Beginning and Ending Amount 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
Balance of unrecognized tax benefits at beginning of year	$ 29,000	$ 28,406	$ 27,237
Increases for tax positions of prior years	4,219	2,784	315
Decreases for tax positions of prior years	0	(96)	(61)
Increases for tax positions established for the current period	3,912	2,542	1,185
Decreases for settlements with taxing authorities	(285)	(220)	0
Reductions resulting from lapse of applicable statute of limitation	(12,630)	(4,462)	(115)
Adjustment resulting from foreign currency translation	94	46	(155)
Balance of unrecognized tax benefits at end of year	$ 24,310	$ 29,000	$ 28,406

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Amount of increase (decrease) in unrecognized tax benefits resulting from foreign currency translation.

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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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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318

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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 decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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

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