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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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