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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Summary of share-based compensation expense |  |
Share-based compensation before income tax benefit | $ 717 | $ 1,999
Income tax benefit | (181) | (744)
Share-based compensation, net of income tax benefit | 536 | 1,255
Performance unit incentive plan (“PUP”) |  |
Summary of share-based compensation expense |  |
Share-based compensation before income tax benefit | 194 | 1,316
Restricted stock |  |
Summary of share-based compensation expense |  |
Share-based compensation before income tax benefit | 503 | 623
Restricted stock units |  |
Summary of share-based compensation expense |  |
Share-based compensation before income tax benefit | $ 20 | $ 60

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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=96867065&loc=d3e5070-113901 + Details
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