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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 416,254 | $ 408,682 | $ 1,226,660 | $ 1,219,110
Expenses | 279,380 | 281,320 | 829,481 | 833,686
Operating profit (loss) | 136,874 | 127,362 | 397,179 | 385,424
Private Banks |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 117,250 | 118,449 | 351,601 | 361,739
Expenses | 110,788 | 116,471 | 329,540 | 343,515
Operating profit (loss) | 6,462 | 1,978 | 22,061 | 18,224
Investment Advisors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 103,033 | 102,550 | 297,916 | 301,632
Expenses | 51,509 | 53,287 | 154,569 | 158,792
Operating profit (loss) | 51,524 | 49,263 | 143,347 | 142,840
Institutional Investors |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 80,337 | 83,466 | 241,559 | 252,391
Expenses | 37,268 | 40,497 | 115,383 | 122,617
Operating profit (loss) | 43,069 | 42,969 | 126,176 | 129,774
Investment Managers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 112,186 | 101,275 | 326,037 | 295,696
Expenses | 71,889 | 65,296 | 209,326 | 191,955
Operating profit (loss) | 40,297 | 35,979 | 116,711 | 103,741
Investments In New Businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 3,448 | 2,942 | 9,547 | 7,652
Expenses | 7,926 | 5,769 | 20,663 | 16,807
Operating profit (loss) | $ (4,478) | $ (2,827) | $ (11,116) | $ (9,155)

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