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Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Related Party Transaction [Line Items]
Net trading	$ 7,824	$ 13,669		$ 32,513		$ 51,311
Income / (loss) from equity method affiliates	101	647		1,715		2,689
Cohen Brothers Financial, L.L.C. [Member]
Related Party Transaction [Line Items]
Management fee revenue						64
TBBK [Member]
Related Party Transaction [Line Items]
Net trading	35	5		436		76
Star Asia [Member]
Related Party Transaction [Line Items]
Management fee revenue	764			1,833
Principal transactions and other income, Gain/(Loss)	183	1,626		(9,051)		(3,433)
Star Asia Manager [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates		279	[1]	158	[1]	859	[1]
Star Asia SPV [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates		276		1,287		1,000
Star Asia Opportunity [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates		(75)		(5)		544
Star Asia Opportunity II [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates		(28)				(28)
Star Asia Capital Management [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	37	198		108		328
Star Asia Special Situations Fund [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Gain/(Loss)	607			577
S.A.A. Manager [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	64			173
EuroDekania Limited [Member]
Related Party Transaction [Line Items]
Management fee revenue						139
Principal transactions and other income, Dividend income and other	410	386		805		569
Principal transactions and other income, Gain/(Loss)	235	268		221		1
Deep Value [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates		(3)		(6)		(14)
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Management fee revenue	764			1,833		203
Net trading	35	5		436		76
Principal transactions and other income, Dividend income and other	410	386		805		569
Principal transactions and other income, Gain/(Loss)	1,025	1,894		(8,253)		(3,432)
Income / (loss) from equity method affiliates	$ 101	$ 647		$ 1,715		$ 2,689
[1] Beginning March 1, 2013, Star Asia Manager was consolidated by the Company. Prior to that, it was treated as an equity method investment. See note A above.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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Amount of realized and unrealized gain (loss) resulting from the difference between acquisition price and selling price or fair value of trading assets and trading liabilities, and from the firm's direct investment activity, conducted separately from customer trading activities, including, but not limited to, investments in private equity, alternative investment products, real estate, and exchanges and memberships.

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The net gain (loss) on trading activities (including both derivative and nonderivative instruments) recognized in the statement of financial performance.

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