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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2018
Schedule of Restricted Stock Units Activity
Activity
The following table shows our RSU activity for 2018.
 
RESTRICTED
STOCK UNITS
(IN THOUSANDS)

WEIGHTED
AVERAGE
GRANT-DATE
FAIR VALUE

Nonvested at December 31, 2017
1,515

$
29.12

Granted
710

34.19

Vested
(560
)
28.81

Forfeited
(72
)
$
30.19

Nonvested at December 31, 2018(1)
1,593

$
31.41

(1) As of December 31, 2018, there were approximately 336 thousand RSUs that had met the requisite service period and will be released as identified in the grant terms.
Weighted Average Assumptions Used in Estimating the Value of Performance Share Units
Weighted Average Assumptions Used in Estimating the Value of Performance Share Units
  
2018 
 GRANTS

2017 
 GRANTS

2016 
 GRANTS

Performance period
1/1/2018-12/31/2020

1/1/2017 – 12/31/2019

1/1/2016 – 12/31/2018

Expected dividends
3.81%

3.74%

3.92% - 5.37%

Risk-free rate
1.75% - 2.34%

0.68% - 1.55%

0.45% - 0.97%

Volatility
17.30% - 21.52%

22.71% - 24.07%

21.87% - 28.09%

Weighted average grant-date fair value
$
35.49

$
37.93

$
22.58
Schedule of Performance Share Units Activity
Activity
The following table shows our PSU activity for 2018.
 
GRANTS
(IN THOUSANDS)

WEIGHTED
AVERAGE
GRANT-DATE
FAIR VALUE

Nonvested at December 31, 2017
965

$
30.87

Granted at target
343

35.49

Vested
(112
)
32.79

Forfeited
(26
)
37.93

Performance adjustment
(128
)
$
34.74

Nonvested at December 31, 2018(1)
1,042

$
31.52

(1) As of December 31, 2018, there were approximately 232 thousand PSUs that had met the requisite service period and will be released as identified in the grant terms.
Schedule of Stock Options Activity
Activity
The following table shows our option unit activity for 2018.
 
OPTIONS
(IN THOUSANDS)

WEIGHTED
AVERAGE
EXERCISE
PRICE

WEIGHTED
AVERAGE
REMAINING
CONTRACTUAL
TERM
(IN YEARS)
AGGREGATE
INTRINSIC
VALUE
(IN MILLIONS)

Outstanding at December 31, 2017
8,487

$
26.47

 
 
Exercised
(2,025
)
$
25.68

 
 
Forfeited or expired
(96
)
$
25.02

 
 
Outstanding at December 31, 2018(1)
6,366

$
26.75

5.33
$
4

Exercisable at December 31, 2018
4,732

$
27.14

4.78
$
4

(1) As of December 31, 2018, there were approximately 573 thousand stock options that had met the requisite service period and will be released as identified in the grant terms.