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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Capital Expenditures	$ 59,143	$ 72,834	$ 52,536
Depreciation	35,300	33,657	33,481
Amortization	38,669	54,280	59,152
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	57,759	71,120	51,385
Depreciation	34,433	32,944	32,463
Amortization	38,388	54,017	58,828
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	19,331	32,454	26,472
Depreciation	21,888	21,237	19,040
Amortization	19,094	25,886	34,159
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	9,329	13,027	11,100
Depreciation	2,040	1,933	3,646
Amortization	7,620	9,905	11,654
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	1,639	3,884	2,614
Depreciation	1,207	1,142	1,241
Amortization	7,324	8,166	2,321
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	26,643	20,968	10,275
Depreciation	9,013	8,468	8,185
Amortization	3,771	9,400	9,955
Operating Segments | Investments in New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	817	787	924
Depreciation	285	164	351
Amortization	579	660	739
Corporate Overhead
Segment Reporting Information [Line Items]
Capital Expenditures	1,384	1,714	1,151
Depreciation	867	713	1,018
Amortization	$ 281	$ 263	$ 324

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