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Variable Interest Entities - Summary of Closed CLO Funds (Details) - Collateralized Loan Obligation Funds - USD ($) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 20, 2017 | Sep. 22, 2016 | Jun. 02, 2016
Trinitas IV |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Offering Amount |  |  |  | $ 406,650
Offering Date | Jun. 02, 2016 |  |  |
Trinitas V |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Offering Amount |  |  | $ 409,000 |
Offering Date | Sep. 22, 2016 |  |  |
Trinitas VI |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Offering Amount |  | $ 717,100 |  |
Offering Date | Jun. 20, 2017 |  |  |

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