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Business Segment Information (Schedule of Financial Information about Business Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 423,225 | $ 416,254 | $ 409,586 | $ 400,820 | $ 405,057 | $ 408,682 | $ 404,830 | $ 405,598 | $ 1,649,885 | $ 1,624,167 | $ 1,526,552
Expenses |  |  |  |  |  |  |  |  | 1,117,265 | 1,116,533 | 1,065,774
Operating profit (loss) |  |  |  |  |  |  |  |  | 532,620 | 507,634 | 460,778
Private Banks |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 470,276 | 483,097 | 474,272
Expenses |  |  |  |  |  |  |  |  | 443,136 | 457,894 | 455,119
Operating profit (loss) |  |  |  |  |  |  |  |  | 27,140 | 25,203 | 19,153
Investment Advisors |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 403,778 | 399,089 | 373,473
Expenses |  |  |  |  |  |  |  |  | 208,508 | 212,439 | 201,833
Operating profit (loss) |  |  |  |  |  |  |  |  | 195,270 | 186,650 | 171,640
Institutional Investors |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 322,062 | 333,299 | 322,457
Expenses |  |  |  |  |  |  |  |  | 153,937 | 163,536 | 161,640
Operating profit (loss) |  |  |  |  |  |  |  |  | 168,125 | 169,763 | 160,817
Investment Managers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 440,796 | 398,076 | 349,444
Expenses |  |  |  |  |  |  |  |  | 282,024 | 259,693 | 226,504
Operating profit (loss) |  |  |  |  |  |  |  |  | 158,772 | 138,383 | 122,940
Investments In New Businesses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 12,973 | 10,606 | 6,906
Expenses |  |  |  |  |  |  |  |  | 29,660 | 22,971 | 20,678
Operating profit (loss) |  |  |  |  |  |  |  |  | $ (16,687) | $ (12,365) | $ (13,772)

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