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Organization and Business	12 Months Ended
Organization and Business	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business Cowen Group, Inc., a Delaware corporation formed in 2009, is a diversified financial services firm and, together with its consolidated subsidiaries (collectively, “Cowen,” “Cowen Group” or the “Company”), provides alternative investment management, investment banking, research, sales and trading and prime brokerage services through its two business segments: alternative investment and broker-dealer. The Company's alternative investment segment, includes hedge funds, private equity structures, registered investment companies and listed vehicles. The Company's broker-dealer segment offers research, sales and trading, prime brokerage and investment banking services to companies and primarily institutional investor clients. Our primary target sectors are healthcare, technology, media and telecommunications, information and technology services, consumer, aerospace and defense, industrials, energy and transportation sectors. On December 5, 2016, the Company effected a one-for-four reverse stock split of our common stock. Except where the context indicates otherwise, all share and per share information has been retroactively adjusted to reflect the reverse stock split.