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Income Taxes - Reconciliation of unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized income tax benefits [Rollforward]
Beginning of year	$ 5,287	$ 7,401	$ 11,297
Additions for tax provisions related to the current year	92	515	54
Additions for tax positions related to prior years	2	646
Reductions for tax positions related to prior years	(505)	(113)	(3,941)
Currency translation adjustment			(9)
Reductions for settlements	(516)	(2,642)
Lapses of applicable statutes of limitation	(582)	(520)
Ending of year	$ 3,778	$ 5,287	$ 7,401

X

- Definition

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

+ References

No definition available.

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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
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- Definition

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

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-Publisher FASB
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- Definition

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.

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

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