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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Options Activity

Stock options A summary of the Company’s stock option activity for the six months ended June 30, 2013 is as follows:

 
Shares under option
(thousands)
 
Weighted average exercise price
 
Weighted average remaining contractual life
(in years)
 
Aggregate intrinsic value
(in millions)
Outstanding and exercisable at December 31, 2012
1,436

 
$
30.65

 
3.4
 
$
58.8

Exercised
(81
)
 
$
28.43

 
 
 
 
Outstanding and exercisable at March 31, 2013
1,355

 
$
30.78

 
3.2
 
$
63.1

Exercised
(201
)
 
$
27.56

 
 
 
 
Outstanding and exercisable at June 30, 2013
1,154

 
$
31.34

 
3.1
 
$
63.2
Nonvested Restricted Stock Activity
A summary of the Company’s restricted stock activity for the six months ended June 30, 2013 is as follows:
 
Shares subject to restriction
(thousands)
 
Weighted average price
Outstanding at December 31, 2012
1,032

 
$
58.77

Granted
372

 
$
75.41

Vested
(331
)
 
$
47.69

Forfeited
(19
)
 
$
68.14

Outstanding at March 31, 2013
1,054

 
$
67.71

Granted
15

 
$
75.32

Vested
(65
)
 
$
72.93

Forfeited
(12
)
 
$
75.68

Outstanding at June 30, 2013
992

 
$
67.37