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Segment Information - Reported Revenue and Profit Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue
Revenue	$ 226,220	$ 211,804	$ 655,365	$ 638,834
Income (loss) before income taxes
Total income (loss) before income taxes	11,828	(1,810)	3,166	(14,396)
Private Client Division [Member]
Revenue
Revenue	147,428	127,835	425,069	376,737
Income (loss) before income taxes
Total income (loss) before income taxes	$ 36,950	$ 20,137	$ 93,763	$ 50,799
Asset management fees	90.00%	77.50%	90.00%	77.50%
Asset Management [Member]
Revenue
Revenue	$ 19,277	$ 23,234	$ 57,247	$ 68,978
Income (loss) before income taxes
Total income (loss) before income taxes	$ 3,338	$ 9,380	$ 11,130	$ 21,851
Asset management fees	10.00%	22.50%	10.00%	22.50%
Capital Markets [Member]
Revenue
Revenue	$ 58,808	$ 60,703	$ 168,418	$ 187,292
Income (loss) before income taxes
Total income (loss) before income taxes	(1,639)	(1,103)	(25,235)	(3,856)
Corporate and Other [Member]
Revenue
Revenue	707	32	4,631	5,827
Income (loss) before income taxes
Total income (loss) before income taxes	$ (26,821)	$ (30,224)	$ (76,492)	$ (83,190)

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 2: 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(10))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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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).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 225
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