Annual report pursuant to Section 13 and 15(d)

Investments

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Investments
12 Months Ended
Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]  
Investments
Investments

Long Term Restricted Investments
Restricted investments relate to reimbursement obligations under letters of credit issued for the benefit of lessors of our office space. As of December 31, 2012 and 2011, our Long-term restricted investments were $3,999 and $3,973, respectively. During the year ended December 31, 2011, $250 of obligations relating to these letters of credit were terminated and a new letter of credit agreement was entered into for $826 for additional space.

Auction Rate Certificates
Auction rate certificates are long-term securities structured to reset their coupon rates by means of an auction. We accounted for our investment in auction rate certificates as available-for-sale securities. In January 2010, our investment in the auction rate certificates was called by the issuer at par plus accrued interest, or $9,456, resulting in a gain of $425 in the year ended December 31, 2010.