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Stock-based Compensation Plans (Tables) | 3 Months Ended
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Mar. 31, 2019
Share-based Compensation [Abstract] |
Summary of RSAs, RSUs, and PSUs Granted | A summary of the RSAs, RSUs, and PSUs granted during 2019 is presented below (shares/units in thousands):
Grant Year |  | Award Type |  | Number of Shares/Units Awarded |  | Vesting Terms
2019 |  | RSA |  | 64 |  | Vest equally over three service periods ending in 2020, 2021, and 2022
2019 |  | RSU |  | 55 |  | Vest equally over three service periods ending in 2019, 2020, and 2021
2019 |  | PSU |  | 53 |  | Three year performance and service period ending in 2021

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