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Business Segment Information (Schedule of Financial Information About Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Revenues	$ 408,682	$ 386,018	$ 1,219,110	$ 1,118,333
Expenses	281,320	271,288	833,686	782,522
Operating profit (loss)	127,362	114,730	385,424	335,811
Private Banks
Segment Reporting Information [Line Items]
Revenues	118,449	118,499	361,739	347,317
Expenses	116,471	115,806	343,515	336,709
Operating profit (loss)	1,978	2,693	18,224	10,608
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	102,550	94,318	301,632	275,302
Expenses	53,287	50,585	158,792	147,504
Operating profit (loss)	49,263	43,733	142,840	127,798
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	83,466	80,411	252,391	235,483
Expenses	40,497	40,003	122,617	117,499
Operating profit (loss)	42,969	40,408	129,774	117,984
Investment Managers
Segment Reporting Information [Line Items]
Revenues	101,275	91,020	295,696	255,123
Expenses	65,296	59,831	191,955	165,743
Operating profit (loss)	35,979	31,189	103,741	89,380
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	2,942	1,770	7,652	5,108
Expenses	5,769	5,063	16,807	15,067
Operating profit (loss)	$ (2,827)	$ (3,293)	$ (9,155)	$ (9,959)

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