Stock Repurchases

6 Months Ended

Jun. 30, 2013

Stockholders' Equity Note [Abstract]

Stock Repurchases

Stock Repurchases:

Our Board of Directors has authorized a total of $700.0 million towards the repurchase of shares of our common stock (the "Share Repurchase Plans"), including a $300.0 million share repurchase authorization approved in December 2012. The Share Repurchase Plans do not have an expiration date. For the six months ended June 30, 2013, we repurchased 0.5 million shares for $33.0 million under the Share Repurchase Plans. As of June 30, 2013, $338.2 million of share repurchases remain authorized.

We also repurchased 0.1 million shares for $5.8 million for the six months ended June 30, 2013 from employees who surrendered their shares to satisfy minimum tax withholding obligations upon the vesting of stock-based compensation awards.