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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 368,810 | $ 354,641 | $ 343,831 | $ 334,263 | $ 335,397 | $ 335,622 | $ 337,745 | $ 325,444 | $ 1,401,545 | $ 1,334,208 | $ 1,266,005
Expenses |  |  |  |  |  |  |  |  | 966,534 | 921,544 | 864,332
Operating profit (loss) |  |  |  |  |  |  |  |  | 435,011 | 412,664 | 401,673
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 2,791 | 2,791 | 5,582
Total profit (loss) |  |  |  |  |  |  |  |  | 437,802 | 415,455 | 407,255
Private Banks [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 457,886 | 456,516 | 441,467
Expenses |  |  |  |  |  |  |  |  | 421,188 | 410,975 | 399,620
Operating profit (loss) |  |  |  |  |  |  |  |  | 36,698 | 45,541 | 41,847
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 2,791 | 2,791 | 5,582
Total profit (loss) |  |  |  |  |  |  |  |  | 39,489 | 48,332 | 47,429
Investment Advisors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 330,677 | 306,620 | 283,811
Expenses |  |  |  |  |  |  |  |  | 180,140 | 171,968 | 146,500
Operating profit (loss) |  |  |  |  |  |  |  |  | 150,537 | 134,652 | 137,311
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | 150,537 | 134,652 | 137,311
Institutional Investors [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 312,584 | 297,568 | 284,677
Expenses |  |  |  |  |  |  |  |  | 153,117 | 145,851 | 140,659
Operating profit (loss) |  |  |  |  |  |  |  |  | 159,467 | 151,717 | 144,018
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | 159,467 | 151,717 | 144,018
Investment Managers [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 294,390 | 267,963 | 251,310
Expenses |  |  |  |  |  |  |  |  | 191,127 | 172,094 | 159,176
Operating profit (loss) |  |  |  |  |  |  |  |  | 103,263 | 95,869 | 92,134
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | 103,263 | 95,869 | 92,134
Investments In New Businesses [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,008 | 5,541 | 4,740
Expenses |  |  |  |  |  |  |  |  | 20,962 | 20,656 | 18,377
Operating profit (loss) |  |  |  |  |  |  |  |  | (14,954) | (15,115) | (13,637)
Gain on sale of subsidiary |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total profit (loss) |  |  |  |  |  |  |  |  | $ (14,954) | $ (15,115) | $ (13,637)

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