Stock Repurchases

12 Months Ended

Dec. 31, 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 (collectively referred to as the "Share Repurchase Plans"), including a $300.0 million share repurchase authorization in December 2012. The Share Repurchase Plans authorize open market repurchase transactions and do not have a stated expiration date. There were no additional share repurchase authorizations in 2013. As of December 31, 2013, $246.2 million of shares may yet be repurchased under the Share Repurchase Plans.

For the years ended December 31, 2013 and 2012, we repurchased 1.7 million shares for $125.0 million and 1.1 million shares for $50.1 million, respectively, under the Share Repurchase Plans. The repurchases in 2013 included 0.2 million shares repurchased in transactions that were executed in 2013 but settled in January 2014.

We also repurchased 0.2 million shares for $12.0 million and 0.2 million shares for $7.8 million for the years ended December 31, 2013 and 2012, respectively, from employees who surrendered their shares to satisfy minimum tax withholding obligations upon the vesting of stock-based compensation awards.