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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 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, 2014
1,714

 
$
16.11

 
1.7
 
$
66.5

Exercised
(251
)
 
$
14.72

 
 
 

Outstanding and exercisable at March 31, 2015
1,463

 
$
16.35

 
1.5
 
$
64.6

Exercised
(103
)
 
$
14.66

 
 
 
 
Outstanding and exercisable at June 30, 2015
1,360

 
$
16.48

 
1.3
 
$
54.9
Nonvested Restricted Stock Activity
A summary of the Company’s nonvested restricted stock for the six months ended June 30, 2015 is as follows:
 
Shares subject to restriction
(thousands)
 
Weighted average price
Nonvested at December 31, 2014
1,266

 
$
43.57

Granted
563

 
$
57.90

Vested
(568
)
 
$
38.35

Forfeited
(12
)
 
$
45.10

Nonvested at March 31, 2015
1,249

 
$
52.49

Granted
124

 
$
60.97

Vested
(20
)
 
$
61.79

Forfeited
(5
)
 
$
52.82

Nonvested at June 30, 2015
1,348

 
$
53.15