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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details) $ in Thousands, £ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 03, 2020 USD ($) | Apr. 03, 2020 GBP (£) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 03, 2020
Offsetting Liabilities [Line Items] |  |  |  |  |
Fair value of investment |  |  | $ 63,068 | $ 61,608 |
Earnings on equity investment in joint venture |  |  | 4,167 | 42,531 |
Net income including noncontrolling interests in subsidiaries |  |  | 67,060 | (125,065) |
Net income attributable to noncontrolling interests in subsidiaries |  |  | 1,870 | 14,126 |
Interest income, other |  |  | 146 | 291 |
Life Sciences Portfolio |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Investment at fair value |  |  | 82,800 | 68,400 |
Acacia |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Distributions received |  |  | 2,800 | 28,400 |
Noncontrolling Interests |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Distributions received |  |  | 1,400 | 14,100 |
Arix |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Fair value of investment |  |  | $ 57,100 |  |
Arix | Arix |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Equity method investment ownership |  |  | 26.00% |  |
MalinJ1 |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Ownership percentage |  |  |  |  | 63.90%
Earnings on equity investment in joint venture |  |  | $ 4,200 | $ 42,500 |
MalinJ1 | MalinJ1 |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Equity method investment ownership |  |  | 41.00% |  |
Option Agreement | Portfolio Companies |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |
Payments to acquire investments | $ 277,500 | £ 223.9 |  |  |

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