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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 2,294 | $ 4,737 | $ 5,056 | $ 9,484
Income tax benefit | (580) | (1,752) | (1,276) | (3,524)
Share-based compensation, net of income tax benefit | 1,714 | 2,985 | 3,780 | 5,960
Performance Unit Incentive Plan (“PUP”) |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 1,607 | 3,941 | 3,125 | 7,184
Restricted stock |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 609 | 672 | 1,779 | 2,069
Restricted stock units |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 78 | $ 124 | $ 152 | $ 231

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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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