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Business Segment Information (Schedule Of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 408,219	$ 386,018	$ 372,331	$ 359,984	$ 368,810	$ 354,641	$ 343,831	$ 334,263	$ 1,526,552	$ 1,401,545	$ 1,334,208
Expenses									1,065,774	966,534	921,544
Operating profit (loss)									460,778	435,011	412,664
Gain on sale of subsidiary									0	2,791	2,791
Total profit (loss)									460,778	437,802	415,455
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues									474,272	457,886	456,516
Expenses									455,119	421,188	410,975
Operating profit (loss)									19,153	36,698	45,541
Gain on sale of subsidiary									0	2,791	2,791
Total profit (loss)									19,153	39,489	48,332
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues									373,473	330,677	306,620
Expenses									201,833	180,140	171,968
Operating profit (loss)									171,640	150,537	134,652
Gain on sale of subsidiary									0	0	0
Total profit (loss)									171,640	150,537	134,652
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues									322,457	312,584	297,568
Expenses									161,640	153,117	145,851
Operating profit (loss)									160,817	159,467	151,717
Gain on sale of subsidiary									0	0	0
Total profit (loss)									160,817	159,467	151,717
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues									349,444	294,390	267,963
Expenses									226,504	191,127	172,094
Operating profit (loss)									122,940	103,263	95,869
Gain on sale of subsidiary									0	0	0
Total profit (loss)									122,940	103,263	95,869
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues									6,906	6,008	5,541
Expenses									20,678	20,962	20,656
Operating profit (loss)									(13,772)	(14,954)	(15,115)
Gain on sale of subsidiary									0	0	0
Total profit (loss)									$ (13,772)	$ (14,954)	$ (15,115)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Topic 360
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-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230

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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 210.5-03.1,2)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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-Section S99
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