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Stock-Based Compensation - 2020 Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Apr. 30, 2020
Stock-based payment awards |  |  |  |  |
Treasury stock purchased | $ 960 | $ 1,150 | $ 1,794 | $ 2,007 |
2020 Plan |  |  |  |  |
Stock-based payment awards |  |  |  |  |
Number of shares authorized for issuance | 8,500,000 |  | 8,500,000 |  |
Reduction in number of shares available for issuance for each stock-settled award granted |  |  |  |  | 1

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- Definition Number of shares authorized for issuance 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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