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Shareholders' Equity
6 Months Ended
Jun. 30, 2014
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders' Equity
 
Retired Shares
 
During the three and six months ended June 30, 2014, we repurchased and contemporaneously retired 1,546 and 12,327 shares of our common stock at an aggregate cost of $4,252 and $30,881, respectively, pursuant to the return of stock by holders of equity incentive awards to pay tax withholding obligations. During the three and six months ended June 30, 2013, we repurchased and contemporaneously retired 109,027 and 237,563 shares of our common stock at an aggregate cost of $0.4 million and $0.9 million, respectively, pursuant to open market purchases and the return of stock by holders of equity incentive awards.

We had 1,459,233 loaned shares outstanding at June 30, 2014 (1,672,656 shares as of December 31, 2013), which were originally lent in connection with our November 2005 issuance of convertible senior notes. Lent shares are retired as they are returned to us.