Stockholders' Equity

12 Months Ended

Dec. 31, 2011

Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]

Stockholders' Equity

Stockholders' Equity

Purchases of the Company's Common Stock

For the years ended December 31, 2011, 2010 and 2009, the Company purchased 7.4 million, 4.1 million and 0.1 million shares of common stock, respectively, utilizing $303.4 million, $159.6 million and $2.9 million in cash, respectively.

Issuances of Common Stock

For the years ended December 31, 2011, 2010 and 2009, the Company issued 29,213; 34,428; and 59,500 shares, respectively, of common stock to the non-employee members of its board of directors. In connection with these shares, the Company recognized stock-based compensation expense for the years ended December 31, 2011, 2010 and 2009 of $1.3 million, $1.3 million and $1.0 million, respectively.

Stock Options and Restricted Stock Awards

See note 12 for a discussion of the stock option and restricted stock awards activity.