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Stock-based Compensation Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Share-based Payment Arrangement [Abstract] |
Summary of RSUs and PSUs Granted | A summary of the RSUs and PSUs granted during 2021 is presented below (units in thousands):
Grant Year |  | Award Type |  | Number of Units Awarded (1) |  | Vesting Terms
2021 |  | RSU |  | 63 |  | Vest equally over three service periods ending in 2024
2021 |  | PSU |  | 27 |  | Three-year performance and service period ending in 2023
2021 |  | RSU |  | 5 |  | One-year service period ending in 2022
(1) PSUs reflect the target number of units for the original PSU grant.

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