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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2012
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On February 1, 2013, the Company and Dahlman Rose & Company, LLC (“Dahlman Rose”) entered into a definitive agreement under which the Company will acquire Dahlman Rose, a privately-held investment bank specializing in the energy, metals and mining, transportation, chemicals and agriculture sectors. This acquisition is an all-stock transaction and is not significant. The transaction, which is expected to close by the end of the first quarter of 2013, is subject to customary closing conditions and regulatory approval. Ramius recently entered into a long-term extension of its partnership with the portfolio managers managing Ramius's long/short global credit fund. As of January 2, 2013, the funds managed by these portfolio managers are operating under the name Orchard Square Partners. The Company has evaluated events through March 7, 2013 which is the date the consolidated financial statements were available to be issued and has determined that there were no additional subsequent events requiring adjustment or disclosure in the consolidated financial statements.