Long Term Restricted Investments

Restricted investments relate to reimbursement obligations under letters of credit issued for the benefit of lessors of certain of our office space.  As of September 30, 2015 and December 31, 2014, our Long-term restricted investments were $9,888 and $5,922, respectively.  During the nine months ended September 30, 2015, we increased our letters of credit by $3,966 associated with leased office space.