Stock Repurchases

3 Months Ended

Mar. 31, 2013

Stockholders' Equity Note [Abstract]

Stock Repurchases

Stock Repurchases:

In 2008, our Board of Directors approved a $300.0 million share repurchase plan, with no stated expiration date, authorizing the repurchase of shares of our common stock through open market purchases (the “2008 Share Repurchase Plan”). In December 2011, our Board of Directors increased the authorized amount of shares that could be repurchased under the 2008 Share Repurchase Plan by $100.0 million to $400.0 million. During the first three months of 2013, no shares were purchased under this plan and as of March 31, 2013, $71.2 million of shares may yet be purchased.

In December 2012, our Board of Directors approved a $300.0 million share repurchase plan, with no stated expiration date, authorizing the repurchase of shares of our common stock through open market purchases (the "2012 Share Repurchase Plan"). As of March 31, 2013, no shares were repurchased under this plan.