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Share-Based Compensation - Summary of Share-Based Compensation (income) expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense before income tax |  | $ 2,653 | $ 7,190 | $ 4,870
Income tax benefit | [1] |  | (2,241) | (1,227)
Share-based compensation expense, net of income tax |  | 2,653 | 4,949 | 3,643
Performance Unit Incentive Plan ("PUP") |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense before income tax |  | (2,187) | 3,990 | 2,260
Restricted Stock Awards And Restricted Stock Units |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense before income tax |  | 4,523 | $ 3,200 | $ 2,610
Stock Options |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation expense before income tax |  | $ 317 |  |
[1] | There was no income tax benefit for the year ended 2020 due to the valuation allowance on our deferred tax assets. Refer to Note 17 – Income Taxes.

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