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Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2014:
 
Number of
Options
 
Weighted-
Average
Exercise
Price
 
(in thousands)
 
 
Outstanding and Exercisable at December 31, 2013
5,325

 
$
35.95

Exercised
(1,065
)
 
28.57

Forfeited/Expired
(154
)
 
32.68

Outstanding and Exercisable at December 31, 2014
4,106

 
37.99
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, 2014:
 
Number of
Shares
 
Weighted-
Average
Grant Date
Fair Value
 
(in thousands)
 
 
Non-vested at December 31, 2013
3,625

 
$
37.33

Granted
2,851

 
35.87

Vested
(1,561
)
 
36.48

Forfeited
(515
)
 
38.10

Non-vested at December 31, 2014
4,400

 
36.59