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Share-Based Compensation - Summary of Share-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | $ 10,969 | $ 8,038 | $ 3,848
Income tax benefit | (4,079) | (2,988) | (1,454)
Share-based compensation, net of income tax benefit | 6,890 | 5,050 | 2,394
Performance unit incentive plan (“PUP”) |  |  |
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | 8,088 | 5,703 | 1,692
Restricted stock |  |  |
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | 2,594 | 2,073 | 2,111
Restricted stock units |  |  |
Summary of share-based compensation expense |  |  |
Share-based compensation before income tax benefit | $ 287 | $ 262 | $ 45

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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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- Definition Allocated share based compensation expense benefit. + References No definition available. + Details
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