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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | $ 7,190 | $ 4,870 | $ 10,969
Income tax benefit | (2,241) | (1,227) | (4,079)
Share-based compensation, net of income tax benefit | 4,949 | 3,643 | 6,890
Performance Unit Incentive Plan (“PUP”) |  |  |
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | 3,990 | 2,260 | 8,088
Restricted stock |  |  |
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | 2,684 | 2,453 | 2,594
Restricted stock units |  |  |
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | $ 516 | $ 157 | $ 287

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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=116856206&loc=d3e5070-113901 + Details
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