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Goodwill And Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | $ 187,848 | $ 175,716
Accumulated Amortization |  | 70,997 | 68,207
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 147,101 | 146,986
Accumulated Amortization |  | 58,056 | 55,809
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 24,713 | 24,713
Accumulated Amortization |  | 10,610 | 10,228
Investment Banking Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 2,603 | 2,598
Accumulated Amortization |  | 1,273 | 1,202
Non-Compete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 1,431 | 1,419
Accumulated Amortization |  | 1,058 | $ 968
Estimated Ziegler Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | [1] | $ 12,000 |
[1] | See discussion regarding the allocation of the estimated goodwill and intangibles recorded for the Ziegler acquisition.

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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=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before 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=66006027&loc=d3e16323-109275 + Details
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