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Shareholders' Equity
 6 Months Ended
Jun. 30, 2016
Stockholders' Equity Note [Abstract]  
Shareholders' Equity
Shareholders' Equity
 
Retired Shares
 
During the three months ended June 30, 2016 and 2015, we repurchased and contemporaneously retired 123,662 and 24,498 shares of our common stock at an aggregate cost of $374,000 and $68,299, respectively, pursuant to both open market and private purchases and the return of stock by holders of equity incentive awards to pay tax withholding obligations. During the six months ended June 30, 2016 and 2015, we repurchased and contemporaneously retired 246,643 and 46,305 shares of our common stock at an aggregate cost of $745,000 and $122,552, respectively, pursuant to both open market and private purchases and the return of stock by holders of equity incentive awards to pay tax withholding obligations.

We had 1,459,233 loaned shares outstanding at June 30, 2016 and December 31, 2015, which were originally lent in connection with our November 2005 issuance of convertible senior notes. We retire lent shares as they are returned to us.