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Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013 cowenfund	Dec. 31, 2012
Organization [Line Items]
Number of funds, Consolidated	8
Deferred rent	$ 16.2	$ 13.8
Total net assets of consolidated VIEs	$ 7.1
Investment Company
Organization [Line Items]
Number of funds, Consolidated	3

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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