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Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of recent share repurchase activity

Period		Average Price

2010	—		—
2011	0.7	$	83.63
2012	0.6	$	107.44

- Definition

Tabular disclosure of an entity's treasury stock, including the average cost per share, carrying basis for each class of treasury stock, description of share repurchase program authorized by an entity's board of directors, the number of shares repurchased, the cost of the shares repurchased, the remaining maximum dollar value of shares available for repurchase under the program, the treatment of the purchase price in excess of the current market value, number of shares held for each class of treasury stock, and other information necessary to a fair presentation.

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