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Organization and Business	9 Months Ended
Organization and Business	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Business	Organization and Business Cowen Inc. (formerly Cowen Group, Inc.), a Delaware corporation formed in 2009, is a diversified financial services firm which, together with its consolidated subsidiaries (collectively, “Cowen,” or the “Company”), operates through its two business segments: investment management and broker-dealer. The Company's investment management segment, includes private investment funds, managed accounts, commodity pools, real estate funds, private equity structures, registered investment companies and listed vehicles. The Company's broker-dealer segment offers investment banking, research, sales and trading, prime brokerage, global clearing and commission management services to companies and primarily institutional investor clients. The Company's primary target sectors are healthcare, technology, media and telecommunications, information and technology services, consumer, aerospace and defense, industrials, energy and transportation. On December 5, 2016, the Company effected a one-for-four reverse stock split of the Company's common stock. Except where the context indicates otherwise, all share and per share information has been retroactively adjusted to reflect the reverse stock split.