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Shareholders' Equity
 12 Months Ended
Dec. 31, 2012
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders’ equity

Pursuant to $100.0 million stock repurchase programs authorized by the Board of Directors in October 2002 and October 2005, and a $200.0 million stock repurchase authorization in February 2006 (for a total stock repurchase authorization of $400.0 million), we have repurchased a total of 9,688,900 shares for a total of $297.7 million, though there were no repurchases under these programs during 2012, 2011, or 2010. At December 31, 2012, we had remaining authorization to purchase $102.3 million of common stock.

Under our stock-based compensation plans, we accept shares as payment under certain conditions related to stock option exercises and vesting of restricted stock, generally related to the payment of minimum tax obligations. During 2012, 2011, and 2010, we repurchased $1.0 million, $2.8 million, and $4.0 million, respectively, of shares from employees under these plans. Such repurchases are excluded from the $400.0 million stock repurchase authorization.