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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables) | 6 Months Ended
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Jun. 30, 2019
Share-based Compensation [Abstract] |
Summary of Share Incentive Plans | A summary of activity under our share incentive plans for the six months ended June 30, 2019 is shown below:
| Nonvested Share Awards Outstanding |  | Weighted Average Exercise / Grant Price
Nonvested share awards outstanding at December 31, 2018 | 390,681 |  |  | $ | 79.82 |
Granted | 197,372 |  |  | 98.71 |
Vested | (254,854 | ) |  | 81.40 |
Forfeited | (11,002 | ) |  | 84.29 |
Total nonvested share awards outstanding at June 30, 2019 | 322,197 |  |  | $ | 89.99 |

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