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Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Summary of share-based compensation expense |  |  |  |  |
Share-based compensation expense before income tax |  | $ 1,937 | $ 1,831 | $ 649 | $ 6,448
Income tax benefit | [1] |  | (460) |  | (1,625)
Share-based compensation expense, net of income tax |  | 1,937 | 1,371 | 649 | 4,823
Performance Unit Incentive Plan ("PUP") |  |  |  |  |
Summary of share-based compensation expense |  |  |  |  |
Share-based compensation expense before income tax |  | 149 | 1,033 | (2,596) | 4,013
Restricted Stock Awards And Restricted Stock Units |  |  |  |  |
Summary of share-based compensation expense |  |  |  |  |
Share-based compensation expense before income tax |  | 1,698 | $ 798 | 3,155 | $ 2,435
Stock Options |  |  |  |  |
Summary of share-based compensation expense |  |  |  |  |
Share-based compensation expense before income tax |  | $ 90 |  | $ 90 |
[1] | There was no income tax benefit for the three and nine months ended September 30, 2020 due to the valuation allowance on our deferred tax assets. Refer to Note 16 – Income Taxes.

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