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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Capital Expenditures	$ 20,066	$ 14,086
Depreciation	6,800	6,447
Amortization	12,022	11,012
Private Banks [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	12,850	8,712
Depreciation	4,410	3,181
Amortization	8,464	7,711
Investment Advisors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	4,532	2,852
Depreciation	733	976
Amortization	2,850	2,553
Institutional Investors [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	811	796
Depreciation	227	334
Amortization	323	399
Investment Managers [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	1,615	1,322
Depreciation	916	1,190
Amortization	216	266
Investments In New Businesses [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	106	94
Depreciation	368	548
Amortization	119	26
Total From Business Segments [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	19,914	13,776
Depreciation	6,654	6,229
Amortization	11,972	10,955
Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Capital Expenditures	152	310
Depreciation	146	218
Amortization	$ 50	$ 57

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
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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- 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

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