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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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 368,810	$ 354,641	$ 343,831	$ 334,263	$ 335,397	$ 335,622	$ 337,745	$ 325,444	$ 1,401,545	$ 1,334,208	$ 1,266,005
Expenses									966,534	921,544	864,332
Operating profit (loss)									435,011	412,664	401,673
Gain on sale of subsidiary									2,791	2,791	5,582
Total profit (loss)									437,802	415,455	407,255
Private Banks [Member]
Segment Reporting Information [Line Items]
Revenues									457,886	456,516	441,467
Expenses									421,188	410,975	399,620
Operating profit (loss)									36,698	45,541	41,847
Gain on sale of subsidiary									2,791	2,791	5,582
Total profit (loss)									39,489	48,332	47,429
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Revenues									330,677	306,620	283,811
Expenses									180,140	171,968	146,500
Operating profit (loss)									150,537	134,652	137,311
Gain on sale of subsidiary									0	0	0
Total profit (loss)									150,537	134,652	137,311
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Revenues									312,584	297,568	284,677
Expenses									153,117	145,851	140,659
Operating profit (loss)									159,467	151,717	144,018
Gain on sale of subsidiary									0	0	0
Total profit (loss)									159,467	151,717	144,018
Investment Managers [Member]
Segment Reporting Information [Line Items]
Revenues									294,390	267,963	251,310
Expenses									191,127	172,094	159,176
Operating profit (loss)									103,263	95,869	92,134
Gain on sale of subsidiary									0	0	0
Total profit (loss)									103,263	95,869	92,134
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Revenues									6,008	5,541	4,740
Expenses									20,962	20,656	18,377
Operating profit (loss)									(14,954)	(15,115)	(13,637)
Gain on sale of subsidiary									0	0	0
Total profit (loss)									$ (14,954)	$ (15,115)	$ (13,637)

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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=64862545&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)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
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