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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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