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Segment and Geographic Information (Reconciliation Of Assets From Segment To Consolidated) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 357,121	$ 341,001	$ 503,035
Investment in equity method affiliates	(52)		2,390
Goodwill	11,113	11,113	11,113
Intangible assets	634		538
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	347,492		491,511
Investment in equity method affiliates	(52)		2,390
Goodwill	11,113		11,113
Intangible assets	634		538
Unallocated [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	9,629		11,524
Capital Markets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	309,897		444,297
Goodwill	7,937		7,937
Intangible assets	332		538
Asset Management Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	8,888		7,774
Investment in equity method affiliates	(69)		555
Goodwill	3,176		3,176
Intangible assets	302
Principal investing [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	28,707		39,440
Investment in equity method affiliates	$ 17		$ 1,835

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 12

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 18

-Article 5

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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267



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

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-Name Accounting Standards Codification

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274



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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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