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FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | $ 690,199 |  | $ 690,199 |  | $ 683,496
Assets, fair value disclosure |  |  |  |  | 698,050
Securities sold, not yet purchased | $ 1,550 |  | $ 1,550 |  | $ 4,651
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Other | Other | Other | Other |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets |  | Other assets |  | Other assets
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Derivative assets | $ 715 |  | $ 715 |  | $ 14,554
Assets, fair value disclosure | 690,914 |  | 690,914 |  |
Securities sold, not yet purchased | 1,550 |  | 1,550 |  | 4,651
Contingent consideration liability | 6,422 |  | 6,422 |  |
Derivative liabilities | 378,300 |  | 378,300 |  | 327,160
Total of liabilities measured at fair value | 386,272 |  | 386,272 |  | 331,811
Fair Value, Measurements, Recurring | Debt |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 5,022 |  | 5,022 |  |
Fair Value, Measurements, Recurring | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 44,603 |  | 44,603 |  | 43,889
Fair Value, Measurements, Recurring | Alternative investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 59,817 |  | 59,817 |  | 56,947
Fair Value, Measurements, Recurring | Debt |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 183,352 |  | 183,352 |  | 178,556
Fair Value, Measurements, Recurring | Equity |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 354,223 |  | 354,223 |  | 350,282
Fair Value, Measurements, Recurring | Private equity |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 43,182 |  | 43,182 |  | 53,822
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Assets, fair value disclosure | 602,278 |  | 602,278 |  | 599,110
Securities sold, not yet purchased | 1,550 |  | 1,550 |  | 4,651
Derivative liabilities |  |  |  |  | 115
Total of liabilities measured at fair value | 1,550 |  | 1,550 |  | 4,766
Fair Value, Measurements, Recurring | Level 1 | Debt |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 5,022 |  | 5,022 |  |
Fair Value, Measurements, Recurring | Level 1 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 43,961 |  | 43,961 |  | 43,243
Fair Value, Measurements, Recurring | Level 1 | Alternative investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 15,767 |  | 15,767 |  | 27,073
Fair Value, Measurements, Recurring | Level 1 | Debt |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 183,348 |  | 183,348 |  | 178,552
Fair Value, Measurements, Recurring | Level 1 | Equity |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 354,180 |  | 354,180 |  | 350,242
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Derivative assets | 715 |  | 715 |  | 14,554
Assets, fair value disclosure | 715 |  | 715 |  | 14,554
Derivative liabilities | 378,300 |  | 378,300 |  | 327,045
Total of liabilities measured at fair value | 378,300 |  | 378,300 |  | 327,045
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Assets, fair value disclosure | 910 |  | 910 |  | 19,418
Contingent consideration liability | 6,422 |  | 6,422 |  |
Total of liabilities measured at fair value | 6,422 |  | 6,422 |  |
Fair Value, Measurements, Recurring | Level 3 | Equities |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 642 |  | 642 |  | 646
Fair Value, Measurements, Recurring | Level 3 | Private equity |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 268 |  | 268 |  | 18,772
Fair Value, Measurements, Recurring | NAV |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Assets, fair value disclosure | 87,011 |  | 87,011 |  | 64,968
Fair Value, Measurements, Recurring | NAV | Alternative investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 44,050 |  | 44,050 |  | 29,874
Fair Value, Measurements, Recurring | NAV | Debt |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 4 |  | 4 |  | 4
Fair Value, Measurements, Recurring | NAV | Equity |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | 43 |  | 43 |  | 40
Fair Value, Measurements, Recurring | NAV | Private equity |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Investments, at fair value | $ 42,914 |  | $ 42,914 |  | $ 35,050

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