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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock option awards activity
The following table summarizes activity involving stock option awards for the year ended December 31, 2018:
 
Number of
Options
 
Weighted-
Average
Exercise
Price
 
(in thousands)
 
 
Outstanding and Exercisable at December 31, 2017
1,022

 
$
27.41

Exercised
(178
)
 
22.49

Forfeited/Expired
(301
)
 
30.25

Outstanding and Exercisable at December 31, 2018
543

 
27.46
Restricted stock and restricted stock unit awards activity
The following table summarizes activity involving restricted stock and restricted stock unit awards for the year ended December 31, 2018:
 
Number of
Shares
 
Weighted-
Average
Grant Date
Fair Value
 
(in thousands)
 
 
Non-vested at December 31, 2017
19,774

 
$
21.90

Granted (1)
9,657

 
17.02

Vested
(9,275
)
 
20.87

Forfeited
(3,097
)
 
22.12

Non-vested at December 31, 2018
17,059

 
19.65

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(1) Shares granted whose related performance conditions were not finalized at December 31, 2018, were excluded from this figure.