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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables) | 9 Months Ended
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Sep. 30, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Summary of Share Incentive Plans | A summary of activity under our share incentive plans for the nine months ended September 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 | 198,896 |  |  | 98.78 |
Vested | (308,514 | ) |  | 82.65 |
Forfeited | (14,651 | ) |  | 85.83 |
Total nonvested share awards outstanding at September 30, 2019 | 266,412 |  |  | $ | 90.37 |

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