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EQUITY SECURITIES PORTFOLIO INVESTMENT - Narrative (Details) £ in Thousands, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 03, 2020 USD ($) | Apr. 03, 2020 GBP (£) | Mar. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 GBP (£) | Oct. 13, 2021 | Dec. 03, 2020
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment at fair value |  |  |  |  |  | $ 0 | $ 2,752 |  |  |
Proceeds from sale of debt securities |  |  |  |  |  |  | 118,500 |  |  |
Interest income, other |  |  |  |  |  | 69 |  |  |  |
Notes receivable, related parties |  |  |  |  |  | 4,000 |  |  |  |
Earnings on equity investment in joint venture |  |  |  |  |  | 3,530 | 0 |  |  |
Net income including noncontrolling interests in subsidiaries |  |  | $ (164,465) | $ (144,805) | $ (55,048) | 149,197 | 109,231 |  |  |
Acquisition of MalinJ1 |  |  |  |  |  | $ 1,168 | 0 |  |  |
Unsecured Debt |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  | 8.00% |
MalinJ1 |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  |  | 63.90%
Equity method investment ownership |  |  |  |  |  | 41.00% |  |  |  |
Earnings on equity investment in joint venture |  |  |  |  |  | $ 3,500 |  |  |  |
Net income including noncontrolling interests in subsidiaries |  |  |  |  |  | 2,400 |  |  |  |
Acquisition of MalinJ1 |  |  |  |  |  | 1,200 |  |  |  |
Equity Securities |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Investment at fair value |  |  |  |  |  | $ 343,100 | 267,800 |  |  |
Option Agreement | Portfolio Companies |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to acquire investments | $ 277,500 | £ 223,900 |  |  |  |  |  |  |  |
Equity securities, FV-NI, realized gain |  |  |  |  |  |  | $ 2,800 |  |  |
Option Agreement | Portfolio Companies | United Kingdom, Pounds |  |  |  |  |  |  |  |  |  |
Offsetting Liabilities [Line Items] |  |  |  |  |  |  |  |  |  |
Return on prepayment | £ |  |  |  |  |  |  |  | £ 4,500 |  |
Proceeds from sale of debt securities | £ |  |  |  |  |  |  |  | £ 33 |  |

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