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Segment And Geographic Information (Reconciliation Of Assets From Segment To Consolidated) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total Assets |  | $ 4,820,292 | $ 2,036,258
Goodwill | [1] | 7,992 | 7,992
Intangible assets | [1] | 166 | 166
Operating Segments [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total Assets |  | 4,815,759 | 2,030,083
Goodwill | [1] | 7,992 | 7,992
Intangible assets | [1] | 166 | 166
Unallocated [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total Assets | [2] | 4,533 | 6,175
Capital Markets [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total Assets |  | 4,782,543 | 2,014,061
Goodwill | [1] | 7,937 | 7,937
Intangible assets | [1] | 166 | 166
Asset Management [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total Assets |  | 3,153 | 3,155
Goodwill | [1] | 55 | 55
Principal Investing [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Total Assets |  | $ 30,063 | $ 12,867
[1] | Goodwill and intangible assets are allocated to the Capital Markets and Asset Management business segments as indicated in the table above.
[2] | Unallocated assets primarily include: (1) amounts due from related parties; (2) furniture and equipment, net; and (3) other assets that are not considered necessary for an understanding of business segment assets. Such amounts are excluded in business segment reporting to the chief operating decision maker.

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