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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 400,820	$ 405,598
Expenses	277,224	274,340
Operating profit (loss)	123,596	131,258
Private Banks
Segment Reporting Information [Line Items]
Revenues	118,259	122,164
Expenses	110,962	112,202
Operating profit (loss)	7,297	9,962
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	94,761	99,192
Expenses	52,502	52,453
Operating profit (loss)	42,259	46,739
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	80,113	85,491
Expenses	38,754	41,249
Operating profit (loss)	41,359	44,242
Investment Managers
Segment Reporting Information [Line Items]
Revenues	104,649	96,855
Expenses	69,066	63,338
Operating profit (loss)	35,583	33,517
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	3,038	1,896
Expenses	5,940	5,098
Operating profit (loss)	$ (2,902)	$ (3,202)

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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-Topic 220
-SubTopic 10
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 280
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-Section 50
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