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Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense (benefit) | $ 2,453 | $ 857 | $ 4,216 | $ (1,288)
Share-based compensation expense before income tax | 2,453 | 857 | 4,216 | (1,288)
Income tax benefit | (28) | 109 | (55) |
Share-based compensation (income) expense, net of income tax | 2,425 | 966 | 4,161 | (1,288)
Performance-based Restricted Stock Units ("PBRS") |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense (benefit) | 466 | (110) | 606 | (2,745)
Share-based compensation expense before income tax | 466 | (110) | 606 | (2,745)
Restricted Stock Awards And Restricted Stock Units |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense (benefit) | 1,436 | 967 | 2,680 | 1,457
Share-based compensation expense before income tax | 1,436 | $ 967 | 2,680 | $ 1,457
Stock Options |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense (benefit) | 551 |  | 930 |
Share-based compensation expense before income tax | $ 551 |  | $ 930 |

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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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