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RELATED PARTY TRANSACTIONS (Details) - USD ($) $ in Thousands | Jun. 29, 2021 | Sep. 30, 2021 | Dec. 31, 2020
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Related Party Transaction [Line Items] |  |  |
Other investments, at fair value |  | $ 892,664 | $ 829,156
Investment In Related Party | Co-investment with Rialto Real Estate Fund IV |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value |  | 14,000 |
Investment In Related Party | Stone Point's Private Equity Fund |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value |  | 8,000 |
Investment In Related Party | Stone Point Credit Corporation |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value |  | 8,000 |
Investment In Related Party | Stone Point Capital, LLC | Co-investment with Rialto Real Estate Fund IV |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value |  | $ 14,000 |
Investment In Related Party | Harrington Reinsurance Holdings Limited | Senior Unsecured Notes Due 2031 |  |  |
Related Party Transaction [Line Items] |  |  |
Other investments, at fair value | $ 10,000 |  |
Related party transaction floating rate (as a percent) | 7.25% |  |

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