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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2014
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 three months ended March 31, 2014 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, 2013
1,997

 
$
15.82

 
2.6
 
$
80.0

Exercised
(54
)
 
$
14.41

 
 
 

Outstanding and exercisable at March 31, 2014
1,943

 
$
15.86

 
2.4
 
$
88.6
Nonvested Restricted Stock Activity
A summary of the Company’s nonvested restricted stock for the three months ended March 31, 2014 is as follows:
 
Shares subject to restriction
(thousands)
 
Weighted average price
Nonvested at December 31, 2013
1,411

 
$
37.86

Granted
420

 
$
53.90

Vested
(498
)
 
$
37.38

Forfeited
(16
)
 
$
39.54

Nonvested at March 31, 2014
1,317

 
$
43.08