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Income Taxes - Changes to Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes to gross unrecognized tax benefits:
Balance at beginning of period	$ 5,081	$ 3,622	$ 3,469
Additions as a result of tax provisions taken during the current year	702	1,489	305
Foreign currency translation		90
Foreign currency translation	(51)		(93)
Lapse in statute of limitations	(80)	(141)	(67)
Settlements	(1,612)	0	0
Other	0	21	8
Balance at end of period	$ 4,040	$ 5,081	$ 3,622

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- Definition

Unrecognized Tax Benefits, Increase (Decrease), Other

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- Definition

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.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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Amount of decrease in unrecognized tax benefits resulting from foreign currency translation.

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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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