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Related Party Transactions (Schedule Of Related Party Transactions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Related Party Transaction [Line Items]
Net trading	$ 38,528		$ 69,486		$ 73,167
Income / (loss) from equity method affiliates	1,828		5,052		6,232
Cohen Brothers Financial, L.L.C. [Member]
Related Party Transaction [Line Items]
Management fee revenue			64		273
TBBK [Member]
Related Party Transaction [Line Items]
Net trading	483		156		658
Star Asia [Member]
Related Party Transaction [Line Items]
Management fee revenue	2,329
Principal transactions and other income, Dividend income and other					38
Principal transactions and other income, Gain/(Loss)	(13,065)		(7,274)		(542)
Star Asia Manager [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	158	[1]	1,101	[1]	1,694	[1]
Star Asia SPV [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	1,287		1,581		702
Star Asia Opportunity [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	(5)		544		405
Star Asia Opportunity II [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates			(382)
Star Asia Capital Management [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	145		504		44
Star Asia Special Situations Fund [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Gain/(Loss)	152		662
S.A.A. Manager [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	255		(8)
EuroDekania [Member]
Related Party Transaction [Line Items]
Management fee revenue			139		667
Net trading					(101)
Principal transactions and other income, Dividend income and other	805		970		298
Principal transactions and other income, Gain/(Loss)	1,167		(331)		579
MFCA [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Dividend income and other					32
Principal transactions and other income, Gain/(Loss)					71
Deep Value [Member]
Related Party Transaction [Line Items]
Management fee revenue					452
Principal transactions and other income, Gain/(Loss)					(9)
Income / (loss) from equity method affiliates	(13)		1,712		4,351
E.B.C. [Member]
Related Party Transaction [Line Items]
Interest expense incurred	59
Mead Park Capital [Member]
Related Party Transaction [Line Items]
Interest expense incurred	144
Duart Fund [Member]
Related Party Transaction [Line Items]
Principal transactions and other income, Gain/(Loss)					(456)
Duart Capital and Other [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates					(964)
Other Related Parties [Member]
Related Party Transaction [Line Items]
Income / (loss) from equity method affiliates	1
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Management fee revenue	2,329		203		1,392
Net trading	483		156		557
Principal transactions and other income, Dividend income and other	805		970		368
Principal transactions and other income, Gain/(Loss)	(11,746)		(6,943)		(357)
Income / (loss) from equity method affiliates	1,828		5,052		6,232
Interest expense incurred	$ 203
[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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