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Stock Plans - Unrecognized Share-based Compensation Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 15,303
Weighted Average Period Expected to be Recognized	1 year 10 months 24 days
Restricted stock units
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 1,325
Weighted Average Period Expected to be Recognized	2 years
Restricted stock awards
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 10,709
Weighted Average Period Expected to be Recognized	2 years
Performance share units
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 3,269
Weighted Average Period Expected to be Recognized	1 year 7 months 6 days

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Topic 718
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