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Goodwill And Intangible Assets (Intangible Assets Subject To Amortization) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | $ 187,622 | $ 175,716
Accumulated Amortization |  | 73,930 | 68,207
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 146,875 | 146,986
Accumulated Amortization |  | 60,271 | 55,809
Trade Name [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 24,713 | 24,713
Accumulated Amortization |  | 10,991 | 10,228
Investment Banking Backlog [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 1,431 | 1,419
Accumulated Amortization |  | 1,137 | 968
Non-Compete Agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value |  | 2,603 | 2,598
Accumulated Amortization |  | 1,331 | $ 1,202
Estimated Ziegler Intangibles [Members] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Value | [1] | 12,000 |
Accumulated Amortization | [1] | $ 200 |
[1] | See discussion regarding the allocation of the estimated goodwill and intangibles recorded for the Ziegler acquisition.

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