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Stock Plans - Unrecognized Share-based Compensation Costs (Details) $ in Thousands | 12 Months Ended
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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

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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