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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 2,411 | $ 2,045 | $ 4,617 | $ 2,762
Income tax benefit | (607) | (515) | (1,165) | (696)
Share-based compensation, net of income tax benefit | 1,804 | 1,530 | 3,452 | 2,066
Performance Unit Incentive Plan (“PUP”) |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 1,557 | 1,324 | 2,980 | 1,518
Restricted stock |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 783 | 667 | 1,476 | 1,170
Restricted stock units |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 71 | $ 54 | $ 161 | $ 74

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- Definition The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Allocated share based compensation expense benefit. + References No definition available. + Details
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