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Share-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax stock-based compensation expense charged against income | $ 7,872 | $ 6,865 | $ 5,900
Total recognized tax (deficiency) benefit related to share-based compensation | (293) | 196 | 1,480
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax stock-based compensation expense charged against income | 2,134 | 2,623 | 2,989
Restricted stock and restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax stock-based compensation expense charged against income | 5,195 | 3,967 | 2,591
Employee Stock Purchase Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total pre-tax stock-based compensation expense charged against income | $ 543 | $ 275 | $ 320

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- Definition Amount of tax benefit for recognition of expense of 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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