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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 409,586	$ 404,830	$ 810,406	$ 810,428
Expenses	272,877	278,026	550,101	552,366
Operating profit (loss)	136,709	126,804	260,305	258,062
Private Banks
Segment Reporting Information [Line Items]
Revenues	116,092	121,126	234,351	243,290
Expenses	107,790	114,842	218,752	227,044
Operating profit (loss)	8,302	6,284	15,599	16,246
Investment Advisors
Segment Reporting Information [Line Items]
Revenues	100,122	99,890	194,883	199,082
Expenses	50,558	53,052	103,060	105,505
Operating profit (loss)	49,564	46,838	91,823	93,577
Institutional Investors
Segment Reporting Information [Line Items]
Revenues	81,109	83,434	161,222	168,925
Expenses	39,361	40,871	78,115	82,120
Operating profit (loss)	41,748	42,563	83,107	86,805
Investment Managers
Segment Reporting Information [Line Items]
Revenues	109,202	97,566	213,851	194,421
Expenses	68,371	63,321	137,437	126,659
Operating profit (loss)	40,831	34,245	76,414	67,762
Investments In New Businesses
Segment Reporting Information [Line Items]
Revenues	3,061	2,814	6,099	4,710
Expenses	6,797	5,940	12,737	11,038
Operating profit (loss)	$ (3,736)	$ (3,126)	$ (6,638)	$ (6,328)

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