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Share-Based Compensation - Summary of Grant Date Fair Value of Awards (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Grant date fair value of awards during the period: |  |  |  |
Options | $ 244 | $ 53 | $ 20,315 | $ 12,633
Restricted stock | 0 | 18 | 4,584 | 3,379
Total | 244 | 71 | 24,899 | 16,012
Share-based compensation expense: |  |  |  |
Options | 1,874 | 1,076 | 5,156 | 3,202
Restricted stock | 911 | 839 | 2,702 | 2,412
Total | 2,785 | 1,915 | 7,858 | 5,614
Income tax benefit/(deficiency) related to share-based compensation [Abstract] |  |  |  |
Options | 233 | 379 | 964 | 980
Restricted stock | 7 | 26 | 462 | 245
Total | $ 240 | $ 405 | $ 1,426 | $ 1,225

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