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Stock Plans
9 Months Ended
Sep. 30, 2011
Stock Plans 
Stock Plans

(11)    The company’s executive and director stock plans are described, and informational disclosures provided, in the notes to the Consolidated Financial Statements included in the Form 10-K for the year ended December 31, 2010. Restricted stock units and restricted shares of 291,912 and 844,706 were granted to executives and directors in the first nine months of 2011 and 2010, respectively, at weighted-average per share prices of $70.59 and $42.93, respectively. For the company’s executives, the restricted units and shares granted in 2011 and 2010 vest ratably over three years. For the company’s directors, other than the initial grant that the directors received upon joining the Board of Directors which vests ratably over a five year period, the restricted units and shares granted in 2011 and 2010 vest or vested on the first anniversary of the grant. During the first nine months of 2011 and 2010, options for the purchase of 548,391 shares at a weighted-average exercise price of $70.76 per share and 1,140,303 shares at a weighted-average exercise price of $42.78 per share, respectively, were awarded to executives. The options granted in 2011 and 2010 vest ratably over three years. The options expire ten years after the grant date.