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Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Summary of share-based compensation expense |  |
Share-based compensation expense (benefit) | $ 1,763 | $ (2,145)
Share-based compensation expense before income tax | 1,763 | (2,145)
Income tax benefit | (27) | (109)
Share-based compensation (income) expense, net of income tax | 1,736 | (2,254)
Performance-based Restricted Stock Units ("PBRS") |  |
Summary of share-based compensation expense |  |
Share-based compensation expense (benefit) | 140 | (2,635)
Share-based compensation expense before income tax | 140 | (2,635)
Restricted Stock Awards And Restricted Stock Units |  |
Summary of share-based compensation expense |  |
Share-based compensation expense (benefit) | 1,244 | 490
Share-based compensation expense before income tax | 1,244 | $ 490
Stock Options |  |
Summary of share-based compensation expense |  |
Share-based compensation expense (benefit) | 379 |
Share-based compensation expense before income tax | $ 379 |

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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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