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Business Segment Information (Schedule Of Additional Information Pertaining To Business Segments) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 19,859 | $ 17,958 | $ 36,894 | $ 25,750
Depreciation | 5,331 | 5,730 | 10,915 | 11,434
Amortization | 9,584 | 8,427 | 18,798 | 16,669
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 9,510 | 11,852 | 18,308 | 16,703
Depreciation | 3,557 | 3,947 | 7,289 | 7,880
Amortization | 6,192 | 5,457 | 12,143 | 10,793
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 4,061 | 4,192 | 7,650 | 5,967
Depreciation | 512 | 517 | 1,003 | 1,026
Amortization | 2,286 | 2,001 | 4,484 | 3,958
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 1,642 | 781 | 2,930 | 1,144
Depreciation | 209 | 222 | 419 | 452
Amortization | 355 | 309 | 695 | 611
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,087 | 852 | 5,222 | 1,475
Depreciation | 512 | 474 | 1,024 | 936
Amortization | 236 | 206 | 464 | 408
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 616 | 187 | 1,196 | 275
Depreciation | 420 | 454 | 950 | 908
Amortization | 458 | 397 | 898 | 785
Total From Business Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 18,916 | 17,864 | 35,306 | 25,564
Depreciation | 5,210 | 5,614 | 10,685 | 11,202
Amortization | 9,527 | 8,370 | 18,684 | 16,555
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 943 | 94 | 1,588 | 186
Depreciation | 121 | 116 | 230 | 232
Amortization | $ 57 | $ 57 | $ 114 | $ 114

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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