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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | $ 15,721 | $ 15,707 | $ 52,615 | $ 41,457
Depreciation | 5,579 | 5,616 | 16,494 | 17,050
Amortization | 9,813 | 8,829 | 28,611 | 25,498
Private Banks [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 7,797 | 9,376 | 26,105 | 26,079
Depreciation | 2,922 | 3,799 | 10,211 | 11,679
Amortization | 6,342 | 5,704 | 18,485 | 16,497
Investment Advisors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,731 | 3,513 | 11,381 | 9,480
Depreciation | 759 | 521 | 1,762 | 1,547
Amortization | 2,341 | 2,105 | 6,825 | 6,063
Institutional Investors [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 239 | 777 | 3,169 | 1,921
Depreciation | 295 | 222 | 714 | 674
Amortization | 363 | 326 | 1,058 | 937
Investment Managers [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 3,115 | 1,596 | 8,337 | 3,071
Depreciation | 907 | 525 | 1,931 | 1,461
Amortization | 242 | 218 | 706 | 626
Investments In New Businesses [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 498 | 186 | 1,694 | 461
Depreciation | 511 | 442 | 1,461 | 1,350
Amortization | 468 | 419 | 1,366 | 1,204
Total From Business Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 15,380 | 15,448 | 50,686 | 41,012
Depreciation | 5,394 | 5,509 | 16,079 | 16,711
Amortization | 9,756 | 8,772 | 28,440 | 25,327
Corporate Overhead [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital Expenditures | 341 | 259 | 1,929 | 445
Depreciation | 185 | 107 | 415 | 339
Amortization | $ 57 | $ 57 | $ 171 | $ 171

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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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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + 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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