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Stock-Based Compensation Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation Activity | A summary of the 2018 RSAs, RSUs, and PSUs granted to certain NEOs, employees, and directors is presented below (shares/units in thousands):
Grant Year |  | Award Type |  | Number of Shares/Units Awarded(1) |  | Vesting Terms
2018 |  | RSA |  | 56 |  | Vest equally over three service periods ending in 2019, 2020, and 2021
2018 |  | RSU |  | 10 |  | Vest over one service period ending in 2019
2018 |  | RSU |  | 48 |  | Vest equally over three service periods ending in 2018, 2019, and 2020
2018 |  | RSU |  | 79 |  | Vest equally over four service periods ending in 2022, 2023, 2024 and 2025
2018 |  | PSU |  | 49 |  | Three year performance and service period ending in 2020
2018 |  | PSU |  | 207 |  | Vest equally over four service periods ending in 2022, 2023, 2024 and 2025 and a three year TSR period ending in 2021
(1) PSUs presented are based on the target number of units for the original PSU grant.
Activity for Awards Made Outside of Share-Based Compensation Plans | Activity for our RSAs, RSUs, and PSUs is presented below (shares/units in thousands):
| PSUs |  | RSAs and RSUs |  | Total
(in thousands, except grant date values) | Number of Shares/Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/Units |  | Weighted Average Grant Date Fair Value |  | Number of Shares/Units |  | Weighted Average Grant Date Fair Value
Balance as of December 31, 2015 | 51 |  |  | $ | 51.00 |  |  | 804 |  |  | $ | 23.99 |  |  | 855 |  |  | $ | 27.90 |
Granted | 59 |  |  | $ | 47.01 |  |  | 188 |  |  | $ | 44.68 |  |  | 247 |  |  | $ | 45.24 |
Vested | — |  |  | $ | — |  |  | (501 | ) |  | $ | 22.54 |  |  | (501 | ) |  | $ | 22.54 |
Canceled/forfeited | — |  |  | $ | — |  |  | (11 | ) |  | $ | 29.64 |  |  | (11 | ) |  | $ | 29.64 |
Balance as of December 31, 2016 | 110 |  |  | $ | 48.86 |  |  | 480 |  |  | $ | 36.90 |  |  | 590 |  |  | $ | 37.23 |
Granted | 65 |  |  | $ | 55.75 |  |  | 173 |  |  | $ | 52.31 |  |  | 238 |  |  | $ | 53.25 |
Performance adjustment(1) | 45 |  |  | $ | 51.00 |  |  | — |  |  | $ | — |  |  | 45 |  |  | $ | 51.00 |
Vested | (96 | ) |  | $ | 51.00 |  |  | (334 | ) |  | $ | 36.79 |  |  | (430 | ) |  | $ | 39.98 |
Canceled/forfeited | — |  |  | $ | — |  |  | (3 | ) |  | $ | 41.92 |  |  | (3 | ) |  | $ | 41.92 |
Balance as of December 31, 2017 | 124 |  |  | $ | 51.59 |  |  | 316 |  |  | $ | 45.51 |  |  | 440 |  |  | $ | 47.23 |
Granted | 256 |  | $ | 68.32 |  |  | 193 |  | $ | 84.78 |  |  | 449 |  | $ | 75.39 |
Performance adjustment(1) | 70 |  | $ | 47.01 |  |  | — |  |  | $ | — |  |  | 70 |  | $ | 47.01 |
Vested | (129 | ) |  | $ | 47.01 |  |  | (217 | ) |  | $ | 46.35 |  |  | (346 | ) |  | $ | 46.60 |
Canceled/forfeited | — |  |  | $ | — |  |  | (17 | ) |  | $ | 54.49 |  |  | (17 | ) |  | $ | 54.49 |
Balance as of December 31, 2018 | 321 |  | $ | 65.77 |  |  | 275 |  | $ | 72.03 |  |  | 596 |  | $ | 68.66 |
(1) Adjustment to number of target units awarded for PSUs based on achievement of performance and TSR goals.
Summary of Unrecognized Stock-based Compensation Expense | A summary of total unrecognized stock-based compensation expense related to RSAs, RSUs, and PSUs (based on current performance estimates), at December 31, 2018 is presented below:
(in millions, except years) | December 31, 2018 |  | Weighted Average Remaining Vesting Period (Years)
Unrecognized RSA expense | $ | 2.9 |  |  | 1.41
Unrecognized RSU expense | 8.5 |  |  | 4.26
Unrecognized PSU expense | 17.8 |  |  | 4.27
Total | $ | 29.2 |  |  | 3.99

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