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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Capital Expenditures	$ 18,498	$ 20,066
Depreciation	7,122	6,800
Amortization	11,854	12,022
Operating Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	18,190	19,914
Depreciation	6,831	6,654
Amortization	11,796	11,972
Operating Segments [Member] | Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	10,239	12,850
Depreciation	3,319	4,410
Amortization	6,627	8,464
Operating Segments [Member] | Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	4,260	4,532
Depreciation	1,105	733
Amortization	2,357	2,850
Operating Segments [Member] | Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	967	811
Depreciation	448	227
Amortization	427	323
Operating Segments [Member] | Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	2,520	1,615
Depreciation	1,809	916
Amortization	2,345	216
Operating Segments [Member] | Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	204	106
Depreciation	150	368
Amortization	40	119
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	308	152
Depreciation	291	146
Amortization	$ 58	$ 50

X

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
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- Definition

Future cash outflow to pay for purchases of fixed assets that have occurred.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

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