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Stock Based Compensation Plan (Tables) | 9 Months Ended
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Sep. 30, 2021
Stock Based Compensation Plan [Abstract] |
Award Activity | The following table summarizes our award activity during the nine months ended September 30, 2021:
|  | Service-Based Restricted Stock Awards |  |  | Performance-Based Restricted Stock Awards |
|  | Shares or Units (#) |  |  | Weighted-Average Award Price ($) |  |  | Shares or Units (#) |  |  | Weighted-Average Award Price ($) |
Outstanding at December 31, 2020 |  |  | 239,281 |  |  |  | 20.77 |  |  |  | 213,895 |  |  |  | 21.08 |
Granted/Issued |  |  | 119,921 |  |  |  | 33.29 |  |  |  | 93,685 |  |  |  | 32.83 |
Awards vested or rights exercised(1) |  |  | (130,323 | ) |  |  | 21.28 |  |  |  | (56,578 | ) |  |  | 22.95 |
Forfeited |  |  | (5,621 | ) |  |  | 24.74 |  |  |  | — |  |  |  | — |
Additional units earned due to performance |  |  | — |  |  |  | — |  |  |  | 77,265 |  |  |  | 20.42 |
Outstanding at September 30, 2021 |  |  | 223,258 |  |  |  | 27.10 |  |  |  | 328,267 |  |  |  | 23.96 |
Restricted units expected to vest |  |  | 223,258 |  |  |  | 27.10 |  |  |  | 387,512 |  |  |  | 25.36 |
(1) | Includes shares repurchased from employees for employee’s tax liability.

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