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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation Activity
A summary of the RSUs and PSUs granted to certain NEOs is presented below (units in thousands):
Grant Year
 
Award Type
 
Number of Units Awarded(1)
 
Vesting Terms
2015
 
RSU
 
23
 
Majority vest equally over two service periods ending December 31 of 2016 and 2017
2015
 
PSU
 
17
 
Three year performance and service period ending December 31, 2017
2016
 
RSU
 
20
 
Vest equally over three service periods ending December 31 of 2016, 2017, and 2018
2016
 
PSU
 
20
 
Three year performance and service period ending December 31, 2018
2017
 
RSU
 
22
 
Vest equally over three service periods ending December 31 of 2017, 2018, and 2019
2017
 
PSU
 
21
 
Three year performance and service period ending December 31, 2019
(1) PSUs presented are based on the target number of units for the original PSU grant. If both performance criteria do not achieve a minimum of 85% of their respective targets, no units will be awarded for the PSU grant.
A summary of the RSAs granted to certain NEOs and employees and RSUs granted to directors is presented below (shares/units in thousands):
Grant Year
 
Award Type
 
Number of Shares/Units Awarded
 
Vesting Terms
2015
 
RSA
 
137
 
Vest over service periods ranging from seven months to three years
2015
 
RSU
 
6
 
Vest over service period ending in April 2016
2016
 
RSA
 
35
 
Majority vest equally over three service periods ending in January of 2017, 2018, and 2019
2016
 
RSU
 
8
 
Vest over service period ending in April 2017
2017
 
RSA
 
29
 
Vest equally over three service periods ending in February of 2018, 2019, and 2020
2017
 
RSU
 
6
 
Vest over service period ending in April 2018
Activity for Awards Made Outside of Share-Based Compensation Plans
Activity for our RSAs, RSUs, and PSUs is presented below (shares/units in thousands):
 
Market Condition & Performance-Based Awards
 
Service Period Awards
 
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, 2014
85

 
$
54.32

 
264

 
$
57.07

 
349

 
$
56.40

Granted
17

 
$
153.01

 
166

 
$
102.34

 
183

 
$
107.06

Vested
(85
)
 
$
48.31

 
(157
)
 
$
65.89

 
(242
)
 
$
57.24

Canceled/forfeited
—

 
$
—

 
(5
)
 
$
91.14

 
(5
)
 
$
91.14

Balance as of December 31, 2015
17

 
$
153.01

 
268

 
$
71.98

 
285

 
$
83.71

Granted
20

 
$
141.02

 
63

 
$
134.04

 
83

 
$
135.71

Vested
—

 
$
—

 
(167
)
 
$
67.61

 
(167
)
 
$
67.61

Canceled/forfeited
—

 
$
—

 
(4
)
 
$
88.92

 
(4
)
 
$
88.92

Balance as of December 31, 2016
37

 
$
146.57

 
160

 
$
110.71

 
197

 
$
111.69

Granted
21
 
$
167.25

 
58
 
$
156.92

 
79
 
$
159.75

Adjustments(1)
15
 
$
153.01

 
—

 
$
—

 
15
 
$
153.01

Vested
(32
)
 
$
153.01

 
(111
)
 
$
110.38

 
(143
)
 
$
119.94

Canceled/forfeited
—

 
$
—

 
(1
)
 
$
125.75

 
(1
)
 
$
125.75

Balance as of December 31, 2017
41
 
$
154.78

 
106
 
$
136.54

 
147
 
$
130.75


(1) Adjustments to number of units awarded for PSUs based on achievement of performance and market conditions.
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, 2017 is presented below:
(in millions, except years)
December 31, 2017
 
Weighted Average Remaining Vesting Period (Years)
Unrecognized RSA expense
$
3.0

 
1.3
Unrecognized RSU expense
2.0

 
1.3
Unrecognized PSU expense
3.4

 
1.7
Total
$
8.4

 
1.5
Activity for Stock Options Outstanding
Activity for our stock options is presented below:
(in thousands, except per average exercise price)
Number of Shares Under Option
 
Weighted Average Exercise Price
Balance as of December 31, 2014
10

 
$
48.63

Granted
—

 
$
—

Exercises
(1
)
 
$
49.95

Canceled/forfeited
—

 
$
—

Balance as of December 31, 2015
9

 
$
48.37

Granted
—

 
$
—

Exercises
(5
)
 
$
52.58

Canceled/forfeited
—

 
$
—

Balance as of December 31, 2016
4

 
$
43.74

Granted
—

 
$
—

Exercises
(4
)
 
$
43.74

Canceled/forfeited
—

 
$
—

Balance as of December 31, 2017
—

 
$
—