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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Summary of Share Based Compensation Activity | The following table summarizes RSU and PSA activity during the past three years:
Units | 2021 |  | 2020 |  | 2019
Balance at January 1, | 1,071,652 |  |  | 896,463 |  |  | 756,786 |
Granted | 374,931 |  |  | 400,854 |  |  | 600,820 |
Forfeited | (103,499) |  |  | (89,483) |  |  | (223,677) |
Shares delivered | (231,702) |  |  | (136,182) |  |  | (237,466) |
Balance at December 31, | 1,111,382 |  |  | 1,071,652 |  |  | 896,463 |
| 2021 |  | 2020 |  | 2019
SOSARs | Shares |  | Wtd Avg Exercise Price |  | Shares |  | Wtd Avg Exercise Price |  | Shares |  | Wtd Avg Exercise Price
Outstanding at January 1, | 1,082,413 |  |  | $ | 20.40 |  |  | 1,291,947 |  |  | $ | 20.05 |  |  | 2,334,742 |  |  | $ | 18.08 |
Granted | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Exercised | (3,300) |  |  | 15.61 |  |  | (58,460) |  |  | 12.85 |  |  | (596,360) |  |  | 15.56 |
Canceled / forfeited | — |  |  | — |  |  | (151,074) |  |  | 20.25 |  |  | (446,435) |  |  | 21.06 |
Outstanding at December 31, | 1,079,113 |  |  | $ | 20.42 |  |  | 1,082,413 |  |  | $ | 20.40 |  |  | 1,291,947 |  |  | $ | 20.05 |
Exercisable at December 31, | 1,079,113 |  |  | 20.42 |  |  | 1,082,413 |  |  | 20.40 |  |  | 1,291,947 |  |  | 20.05 |
Vested and expected to vest | 1,079,113 |  |  |  |  | 1,082,413 |  |  |  |  | 1,291,947 |  |  |
Compensation expense (in thousands) | $ | — |  |  |  |  | $ | — |  |  |  |  | $ | 40 |  |  |
Compensation Expense for Stock Option Activity |
In thousands | 2021 |  | 2020 |  | 2019
Compensation expense | $ | 5,063 |  |  | $ | 5,655 |  |  | $ | 3,543 |

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