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Stock Based Compensation (Tables)
3 Months Ended
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Restricted Stock, Restricted Unit and Performance Share Award Activity
Restricted stock, restricted stock units, and performance share award activity for 2012 under all of the Company's incentive plans is summarized in the following table:
 
Shares
outstanding
 
Weighted average
grant date fair value
December 31, 2011
945,265

 

$34.93

Granted
68,000

 
62.20

Performance share adjustments
(10,145
)
 
50.78

Vested
(208,669
)
 
17.66

Forfeited
(1,009
)
 
47.60

March 31, 2012
793,442

 

$41.63

Stock Option Activity
Stock option activity for 2012, under all of the Company's incentive plans, is summarized in the following table:
 
Outstanding
 
Exercisable
Stock options
Shares subject
to option
 
Weighted
average exercise
price per share
 
Options
exercisable at
end of period
 
Weighted
average exercise
price per share
December 31, 2011
3,153,506

 

$31.43

 
2,405,638

 

$25.85

Granted
24,300

 
62.20

 
 

 
 

Expired / Forfeited

 

 
 

 
 

Exercised
(169,068
)
 
25.00

 
 

 
 

March 31, 2012
3,008,738

 

$32.04

 
2,275,854

 

$25.79