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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
item
Dec. 31, 2012
Letters of Credit    
Outstanding letters of credit $ 600 $ 1,221
Number of office spaces in New York, New York and Boston, Massachusetts 2  
Legal Contingencies    
Reserves established for losses which are reasonably possible $ 0 $ 0