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Cash collateral pledged	12 Months Ended
Cash collateral pledged	Dec. 31, 2011
Cash Collateral Pledged
Cash collateral pledged	Cash collateral pledged As of December 31, 2011 and 2010, cash collateral pledged in the amount of $9.8 million and $8.6 million, respectively, primarily relates to (a) a bond held as collateral on a letter of credit and (b) letters of credit issued to the landlord of the Company's premises in New York City (see Note 20). Also included in cash collateral pledged as of December 31, 2011 and 2010 is $0.5 million, respectively, relating to an agreement that the Company has with Société Générale to cover the costs of litigation matters included in the agreement.