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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 408,219 | $ 386,018 | $ 372,331 | $ 359,984 | $ 368,810 | $ 354,641 | $ 343,831 | $ 334,263 | $ 1,526,552 | $ 1,401,545 | $ 1,334,208
Expenses |  |  |  |  |  |  |  |  | 1,065,774 | 966,534 | 921,544
Operating profit (loss) |  |  |  |  |  |  |  |  | 460,778 | 435,011 | 412,664
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 2,791 | 2,791
Total profit (loss) |  |  |  |  |  |  |  |  | 460,778 | 437,802 | 415,455
Private Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 474,272 | 457,886 | 456,516
Expenses |  |  |  |  |  |  |  |  | 455,119 | 421,188 | 410,975
Operating profit (loss) |  |  |  |  |  |  |  |  | 19,153 | 36,698 | 45,541
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 2,791 | 2,791
Total profit (loss) |  |  |  |  |  |  |  |  | 19,153 | 39,489 | 48,332
Investment Advisors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 373,473 | 330,677 | 306,620
Expenses |  |  |  |  |  |  |  |  | 201,833 | 180,140 | 171,968
Operating profit (loss) |  |  |  |  |  |  |  |  | 171,640 | 150,537 | 134,652
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | 171,640 | 150,537 | 134,652
Institutional Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 322,457 | 312,584 | 297,568
Expenses |  |  |  |  |  |  |  |  | 161,640 | 153,117 | 145,851
Operating profit (loss) |  |  |  |  |  |  |  |  | 160,817 | 159,467 | 151,717
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | 160,817 | 159,467 | 151,717
Investment Managers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 349,444 | 294,390 | 267,963
Expenses |  |  |  |  |  |  |  |  | 226,504 | 191,127 | 172,094
Operating profit (loss) |  |  |  |  |  |  |  |  | 122,940 | 103,263 | 95,869
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | 122,940 | 103,263 | 95,869
Investments In New Businesses [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,906 | 6,008 | 5,541
Expenses |  |  |  |  |  |  |  |  | 20,678 | 20,962 | 20,656
Operating profit (loss) |  |  |  |  |  |  |  |  | (13,772) | (14,954) | (15,115)
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | $ (13,772) | $ (14,954) | $ (15,115)

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