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Stock Option and Incentive Plans (Tables)
6 Months Ended
Jun. 30, 2012
Stock Option and Incentive Plans  
Summary of the Company's stock option plan activity

 

 
  Stock Options   Weighted
Average
Exercise
Price
  Weighted
Average
Remaining
Contractual
Life (years)
 

Unexercised options outstanding—January 1, 2012

    5.1   $ 68.18        

Options granted

    0.0     107.63        

Options exercised

    (0.4 )   52.02        

Options forfeited

    (0.0 )   116.35        
                   

Unexercised options outstanding—June 30, 2012

    4.7     69.68     4.1  
                   

Exercisable at June 30, 2012

    2.5     63.47     3.4