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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 1,831 | $ 2,294 | $ 6,448 | $ 5,056
Income tax benefit | (460) | (580) | (1,625) | (1,276)
Share-based compensation, net of income tax benefit | 1,371 | 1,714 | 4,823 | 3,780
Performance Unit Incentive Plan (“PUP”) |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 1,033 | 1,607 | 4,013 | 3,125
Restricted stock |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 687 | 609 | 2,163 | 1,779
Restricted stock units |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 111 | $ 78 | $ 272 | $ 152

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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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