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Stock-Based Compensation Plans (Tables)
 12 Months Ended
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