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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of share-based compensation expense | Share-based compensation expense was as follows:
| For the three months ended June 30, |  | For the six months ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock options, net of estimated forfeitures | $ | 2,074 |  |  | $ | 9,550 |  |  | $ | (5,092 | ) |  | $ | 28,831 |
Restricted stock awards | 5,613 |  |  | 3,399 |  |  | 9,023 |  |  | 6,506 |
Total | $ | 7,687 |  |  | $ | 12,949 |  |  | $ | 3,931 |  |  | $ | 35,337 |

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