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Consolidation - Revenue and Expenses of Consolidated Investment Product (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income: |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 138,065 | $ 152,210 | $ 132,932 | $ 129,028 | $ 128,024 | $ 123,675 | $ 94,132 | $ 79,776 |  |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Common Stockholders | $ 77 | $ 24,913 | $ 20,986 | $ 21,216 | $ 3,414 | $ 16,708 | $ (2,389) | $ 10,943 | $ 67,192 | $ 28,676 | $ 48,502
CLOs |  |  |  |  |  |  |  |  |  |  |
Income: |  |  |  |  |  |  |  |  |  |  |
Realized and unrealized gain (loss), net |  |  |  |  |  |  |  |  | (16,202) |  |
Interest Income |  |  |  |  |  |  |  |  | 96,666 |  |
Total revenues |  |  |  |  |  |  |  |  | 80,464 |  |
Expenses: |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | 2,547 |  |
Interest expense |  |  |  |  |  |  |  |  | 64,788 |  |
Total Expense |  |  |  |  |  |  |  |  | 67,335 |  |
Noncontrolling interest |  |  |  |  |  |  |  |  | (37) |  |
Net Income (Loss) Attributable to Common Stockholders |  |  |  |  |  |  |  |  | $ 13,092 |  |

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