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Segment Operating Results - (Footnotes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |
Other Revenue, net | $ 5,855 | $ 1,140 | $ 7,206 | $ (1,628)
Net Realized and Unrealized Gains on Private Equity Fund Investments | (337) | 1,208 | (195) | (985)
Special Charges | 1,967 | 0 | 3,864 | 21,507
Acquisition and Transition Costs | 0 | 599 | 21 | 976
Total Other Expenses | 7,888 | 12,240 | 21,826 | 34,639
Investment Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Revenue, net | 4,108 | (878) | 3,219 | (3,431)
Interest expense on Notes Payable, Subordinated Borrowing and Line of Credit | 2,300 | 2,488 | 6,861 | 7,494
Amortization of LP Units / Interests and Certain Other Awards | 3,764 | 9,249 | 11,470 | 4,980
Special Charges | 1,967 | 0 | 3,864 | 14,400
Acquisition and Transition Costs | 0 | 107 | 0 | 107
Intangible Asset and Other Amortization | 2,157 | 2,392 | 6,471 | 7,176
Total Other Expenses | 7,888 | 11,748 | 21,805 | 26,663
Investment Management [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other Revenue, net | 1,747 | 2,018 | 3,987 | 1,803
Special Charges | 0 | 0 | 0 | 7,107
Acquisition and Transition Costs | 0 | 492 | 21 | 869
Total Other Expenses | $ 0 | 492 | $ 21 | 7,976
Other Revenue, Including Interest and Investments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Principal Trading Losses |  | (343) |  | (606)
Net Realized and Unrealized Gains on Private Equity Fund Investments |  | 1,952 |  | 1,427
Other Revenue, Including Interest and Investments [Member] | Investment Banking [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Principal Trading Losses |  | (343) |  | (606)
Other Revenue, Including Interest and Investments [Member] | Investment Management [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Realized and Unrealized Gains on Private Equity Fund Investments |  | $ 1,952 |  | $ 1,427

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