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Business Changes and Developments Intangible Assets Associated With Acquisitions (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 62,764 | $ 103,279
Intangible Assets, accumulated amortization | 21,754 | 33,735
Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 56,020 | 53,255
Intangible Assets, accumulated amortization | 18,088 | 4,254
Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 6,744 | 50,024
Intangible Assets, accumulated amortization | 3,666 | 29,481
Client Related [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 56,830 | 93,630
Intangible Assets, accumulated amortization | 20,592 | 31,116
Client Related [Member] | Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 50,700 | 47,800
Intangible Assets, accumulated amortization | 17,201 | 4,006
Client Related [Member] | Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 6,130 | 45,830
Intangible Assets, accumulated amortization | 3,391 | 27,110
Non Compete Non Solicit Agreements [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 169 | 2,084
Intangible Assets, accumulated amortization | 108 | 1,830
Non Compete Non Solicit Agreements [Member] | Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 0 | 135
Intangible Assets, accumulated amortization | 0 | 121
Non Compete Non Solicit Agreements [Member] | Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 169 | 1,949
Intangible Assets, accumulated amortization | 108 | 1,709
Other Intangible Assets Associated With Acquisition [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 5,765 | 7,565
Intangible Assets, accumulated amortization | 1,054 | 789
Other Intangible Assets Associated With Acquisition [Member] | Investment Banking [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 5,320 | 5,320
Intangible Assets, accumulated amortization | 887 | 127
Other Intangible Assets Associated With Acquisition [Member] | Investment Management [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 445 | 2,245
Intangible Assets, accumulated amortization | $ 167 | $ 662

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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