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Income Taxes - 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 at the beginning of the period	$ 1,706	$ 1,757	$ 1,895
Additions based on tax positions related to prior years	78	8	0
Reductions based on tax positions related to prior years	(7)	(30)	(171)
Additions for tax positions of the current year	48	167	100
Lapse of statute of limitations	(657)	(196)	(67)
Balance at the end of the period	1,168	1,706	1,757
Portion of uncertain tax benefit, if recognized, would reduce effective tax rate	300	200	100
Increase (decrease) in accrued interest as a result of the reversal of accrued interest associated with the lapse of statutes of limitations	(108)	(20)	5
Interest accrued on unrecognized tax benefits	$ 300	$ 400	$ 400

X

- Definition

This element represents the decrease in the amount of interest expense accrued as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

+ References

No definition available.

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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 tax positions taken in prior period tax returns.

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- Definition

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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- Definition

Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of interest expense accrued for an underpayment of income taxes.

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- Definition

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

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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