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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 4,737 | $ 2,210 | $ 9,484 | $ 4,709
Income tax benefit | (1,752) | (812) | (3,524) | (1,750)
Share-based compensation, net of income tax benefit | 2,985 | 1,398 | 5,960 | 2,959
Performance unit incentive plan (“PUP”) |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 3,941 | 1,601 | 7,184 | 2,952
Restricted stock |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | 672 | 523 | 2,069 | 1,597
Restricted stock units |  |  |  |
Summary of share-based compensation expense |  |  |  |
Share-based compensation before income tax benefit | $ 124 | $ 86 | $ 231 | $ 160

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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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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