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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Capital Expenditures	$ 17,254	$ 18,498
Depreciation	7,331	7,122
Amortization	12,679	11,854
Operating Segments
Segment Reporting Information [Line Items]
Capital Expenditures	16,869	18,190
Depreciation	6,995	6,831
Amortization	12,621	11,796
Operating Segments | Private Banks
Segment Reporting Information [Line Items]
Capital Expenditures	8,461	10,239
Depreciation	3,549	3,319
Amortization	7,141	6,627
Operating Segments | Investment Advisors
Segment Reporting Information [Line Items]
Capital Expenditures	3,947	4,260
Depreciation	1,179	1,105
Amortization	2,523	2,357
Operating Segments | Institutional Investors
Segment Reporting Information [Line Items]
Capital Expenditures	871	967
Depreciation	405	448
Amortization	433	427
Operating Segments | Investment Managers
Segment Reporting Information [Line Items]
Capital Expenditures	3,349	2,520
Depreciation	1,771	1,809
Amortization	2,339	2,345
Operating Segments | Investments In New Businesses
Segment Reporting Information [Line Items]
Capital Expenditures	241	204
Depreciation	91	150
Amortization	185	40
Corporate
Segment Reporting Information [Line Items]
Capital Expenditures	385	308
Depreciation	336	291
Amortization	$ 58	$ 58

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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.

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