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Share-based Compensation and Non-Qualified Deferred Compensation Plan (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2021 is shown below:
|  |  |  |  | Nonvested Share Awards Outstanding |  | Weighted Average Exercise / Grant Price
Nonvested share awards outstanding at December 31, 2020 |  |  |  |  | 239,728 |  |  | $ | 103.48 |
Granted |  |  |  |  | 187,933 |  |  | 105.63 |
Vested |  |  |  |  | (231,280) |  |  | 101.96 |
Forfeited |  |  |  |  | (9,373) |  |  | 106.67 |
Total nonvested share awards outstanding at September 30, 2021 |  |  |  |  | 187,008 |  |  | $ | 107.36 |

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