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Share-Based Compensation - Summary of Grant Date Fair Value of Awards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Options | $ 3,699 | $ 6,102 | $ 3,685
Restricted stock | 4,217 | 3,147 | 2,985
Total | $ 7,916 | $ 9,249 | $ 6,670

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- Definition Fair value of options awarded during the period. + References No definition available. + Details
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- Definition Fair value of restricted stock awarded during period. + References No definition available. + Details
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- Definition Total fair value of options and restricted stock awarded during period. + References No definition available. + Details
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- References No definition available. + Details
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