Income Taxes - Unrecognized Tax Liability (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 2,355	$ 2,865
Additions to:
Positions taken during the current year	641	58
Positions taken during a prior year	52	163
Exchange rate impact	14	0
Deductions due to:
Exchange rate impact	0	(22)
Positions taken during a prior year	0	(546)
Lapse of statute of limitations	(190)	(163)
Balance at end of year	$ 2,872	$ 2,355

Unrecognized Tax Benefits, Decreases [Abstract]

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Unrecognized Tax Benefits, Increases [Abstract]

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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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Amount of unrecognized tax benefits.

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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 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.

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

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

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