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Summary of Significant Accounting Policies (Summary of Revenue Concentration) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 contract	Dec. 31, 2012 contract	Dec. 31, 2011 contract
CDO asset management revenue and related service	$ 14,228	$ 21,729	$ 19,055
Asset management	19,803	23,172	21,698
Revenues	57,517	95,240	100,331
CDO asset management % as compared to total asset management fees	72.00%	94.00%	88.00%
CDO asset management % as compared to total revenues	25.00%	23.00%	19.00%
Number of CDOs generating management fees	21	25	26
Principal transactions and other income	(7,232)	(2,439)	1,881
Principal transactions % as compared to total revenues	(13.00%)	(3.00%)	2.00%
Institutional Financial Markets, Inc. [Member]
Revenues	$ (11,502)	$ 2,666	$ (5,480)

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- Definition

Collateralized Debt Obligation Asset Management Percentage Compare to Total Asset Management Fees

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- Definition

Collateralized Debt Obligation Asset Management Percentage Compare to Total Revenues

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- Definition

Collateralized Debt Obligation Asset Management Revenue and Related Service Agreements

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- Definition

Number of Collateralized Debt Obligations Generating Management Fees

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- Definition

Principal transactions include all gains, losses, and income (interest and dividend) from securities or loans classified as other investments, at fair value (including gains and losses on derivatives classified as other investments, at fair value) in the consolidated balance sheets. Other income includes foreign currency gains and losses, interest earned on cash and cash equivalents, and other miscellaneous income.

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- Definition

Principal Transactions as a Percentage of Total Revenues

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- Definition

Amount of fixed fee revenue for the management of an investment fund portfolio. Excludes investment advisory, distribution and servicing, and performance fees.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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