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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 404,830	$ 372,331	$ 810,428	$ 732,315
Expenses	278,026	259,372	552,366	511,234
Operating profit (loss)	126,804	112,959	258,062	221,081
Private Banks
Segment Reporting Information [Line Items]
Revenues	121,126	116,184	243,290	228,818
Expenses	114,842	112,353	227,044	220,903
Operating profit (loss)	6,284	3,831	16,246	7,915
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	99,890	92,746	199,082	180,984
Expenses	53,052	49,380	105,505	96,919
Operating profit (loss)	46,838	43,366	93,577	84,065
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	83,434	78,068	168,925	155,072
Expenses	40,871	38,668	82,120	77,496
Operating profit (loss)	42,563	39,400	86,805	77,576
Investment Managers
Segment Reporting Information [Line Items]
Revenues	97,566	83,616	194,421	164,103
Expenses	63,321	53,847	126,659	105,912
Operating profit (loss)	34,245	29,769	67,762	58,191
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	2,814	1,717	4,710	3,338
Expenses	5,940	5,124	11,038	10,004
Operating profit (loss)	$ (3,126)	$ (3,407)	$ (6,328)	$ (6,666)

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