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Investments	3 Months Ended
Investments	Mar. 31, 2013
Investments, All Other Investments [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 March 31, 2013 and December 31, 2012, our Long-term restricted investments were $3,999.