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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Share Based Compensation Activity | The following table summarizes RSU and PSA activity during periods indicated:
Units | 2021 |  | 2020
Balance at January 1, | 1,071,652 |  |  | 896,463 |
Granted | 363,104 |  |  | 386,995 |
Forfeited | (101,431) |  |  | (87,523) |
Shares delivered | (196,637) |  |  | (136,182) |
Balance at September 30, | 1,136,688 |  |  | 1,059,753 |
The following table sets forth information related to outstanding SOSARs:
| 2021 |  | 2020
SOSARS | Shares |  | Wtd Avg Exercise Price |  | Shares |  | Wtd Avg Exercise Price
Outstanding at January 1, | 1,082,413 |  |  | $ | 20.40 |  |  | 1,291,947 |  |  | $ | 20.05 |
Granted | — |  |  | — |  |  | — |  |  | — |
Exercised | — |  |  | — |  |  | (58,460) |  |  | 12.85 |
Canceled / forfeited | — |  |  | — |  |  | (151,074) |  |  | 20.25 |
Outstanding at September 30, | 1,082,413 |  |  | $ | 20.40 |  |  | 1,082,413 |  |  | $ | 20.40 |
Compensation Expense for Stock Option Activity Included in Continuing Operations | The following table sets forth aggregate RSU and PSA compensation expense included in continuing operations for the periods indicated:
| September 30
In thousands | 2021 |  | 2020
Three months ended | $ | 1,478 |  |  | $ | 1,617 |
Nine months ended | 4,015 |  |  | 3,994 |

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