FAIR VALUE MEASUREMENTS - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 |
Assets: | | |
Investments, at fair value | $ 687,507 | $ 701,964 |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
Liabilities: | | |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] | Other liabilities | Other liabilities |
Fair Value, Measurements, Recurring | | |
Assets: | | |
Derivative assets | $ 4,879 | $ 2,789 |
Assets, fair value disclosure | 786,369 | 704,753 |
Liabilities: | | |
Securities sold, not yet purchased | 5,235 | 4,809 |
Contingent consideration liability | 4,389 | 6,583 |
Derivative liabilities | 274,033 | 368,673 |
Total of liabilities measured at fair value | 283,657 | 380,065 |
Fair Value, Measurements, Recurring | Debt | | |
Assets: | | |
Investments, at fair value | 99,254 | 4,285 |
Fair Value, Measurements, Recurring | Equity | | |
Assets: | | |
Investments, at fair value | 54,442 | 54,717 |
Fair Value, Measurements, Recurring | Alternative investments | | |
Assets: | | |
Investments, at fair value | 57,679 | 61,680 |
Fair Value, Measurements, Recurring | Debt | | |
Assets: | | |
Investments, at fair value | 145,151 | 191,325 |
Fair Value, Measurements, Recurring | Equity | | |
Assets: | | |
Investments, at fair value | 282,782 | 343,139 |
Fair Value, Measurements, Recurring | Private equity | | |
Assets: | | |
Investments, at fair value | 48,199 | 46,818 |
Fair Value, Measurements, Recurring | U.S. Treasury Securities | | |
Assets: | | |
Deposits with banks and short-term investments (a) | 24,488 | |
Fair Value, Measurements, Recurring | U.S. Treasury Securities | | |
Assets: | | |
Cash and cash equivalents | 69,495 | |
Fair Value, Measurements, Recurring | Level 1 | | |
Assets: | | |
Derivative assets | 0 | 0 |
Assets, fair value disclosure | 669,846 | 598,186 |
Liabilities: | | |
Securities sold, not yet purchased | 5,235 | 4,809 |
Contingent consideration liability | 0 | 0 |
Derivative liabilities | 0 | 0 |
Total of liabilities measured at fair value | 5,235 | 4,809 |
Fair Value, Measurements, Recurring | Level 1 | Debt | | |
Assets: | | |
Investments, at fair value | 98,350 | 4,285 |
Fair Value, Measurements, Recurring | Level 1 | Equity | | |
Assets: | | |
Investments, at fair value | 53,831 | 54,224 |
Fair Value, Measurements, Recurring | Level 1 | Alternative investments | | |
Assets: | | |
Investments, at fair value | 10,540 | 15,676 |
Fair Value, Measurements, Recurring | Level 1 | Debt | | |
Assets: | | |
Investments, at fair value | 130,409 | 180,907 |
Fair Value, Measurements, Recurring | Level 1 | Equity | | |
Assets: | | |
Investments, at fair value | 282,733 | 343,094 |
Fair Value, Measurements, Recurring | Level 1 | Private equity | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Securities | | |
Assets: | | |
Deposits with banks and short-term investments (a) | 24,488 | |
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury Securities | | |
Assets: | | |
Cash and cash equivalents | 69,495 | |
Fair Value, Measurements, Recurring | Level 2 | | |
Assets: | | |
Derivative assets | 4,879 | 2,789 |
Assets, fair value disclosure | 20,522 | 13,202 |
Liabilities: | | |
Securities sold, not yet purchased | 0 | 0 |
Contingent consideration liability | 0 | 0 |
Derivative liabilities | 274,033 | 368,673 |
Total of liabilities measured at fair value | 274,033 | 368,673 |
Fair Value, Measurements, Recurring | Level 2 | Debt | | |
Assets: | | |
Investments, at fair value | 904 | 0 |
Fair Value, Measurements, Recurring | Level 2 | Equity | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | Alternative investments | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | Debt | | |
Assets: | | |
Investments, at fair value | 14,739 | 10,413 |
Fair Value, Measurements, Recurring | Level 2 | Equity | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | Private equity | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury Securities | | |
Assets: | | |
Deposits with banks and short-term investments (a) | 0 | |
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury Securities | | |
Assets: | | |
Cash and cash equivalents | 0 | |
Fair Value, Measurements, Recurring | Level 3 | | |
Assets: | | |
Derivative assets | 0 | 0 |
Assets, fair value disclosure | 875 | 766 |
Liabilities: | | |
Securities sold, not yet purchased | 0 | 0 |
Contingent consideration liability | 4,389 | 6,583 |
Derivative liabilities | 0 | 0 |
Total of liabilities measured at fair value | 4,389 | 6,583 |
Fair Value, Measurements, Recurring | Level 3 | Debt | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Equity | | |
Assets: | | |
Investments, at fair value | 611 | 493 |
Fair Value, Measurements, Recurring | Level 3 | Alternative investments | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Debt | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Equity | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | Level 3 | Private equity | | |
Assets: | | |
Investments, at fair value | 264 | 273 |
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury Securities | | |
Assets: | | |
Deposits with banks and short-term investments (a) | 0 | |
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury Securities | | |
Assets: | | |
Cash and cash equivalents | 0 | |
Fair Value, Measurements, Recurring | NAV | | |
Assets: | | |
Derivative assets | 0 | 0 |
Assets, fair value disclosure | 95,126 | 92,599 |
Liabilities: | | |
Securities sold, not yet purchased | 0 | 0 |
Contingent consideration liability | 0 | 0 |
Derivative liabilities | 0 | 0 |
Total of liabilities measured at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Debt | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Equity | | |
Assets: | | |
Investments, at fair value | 0 | 0 |
Fair Value, Measurements, Recurring | NAV | Alternative investments | | |
Assets: | | |
Investments, at fair value | 47,139 | 46,004 |
Fair Value, Measurements, Recurring | NAV | Debt | | |
Assets: | | |
Investments, at fair value | 3 | 5 |
Fair Value, Measurements, Recurring | NAV | Equity | | |
Assets: | | |
Investments, at fair value | 49 | 45 |
Fair Value, Measurements, Recurring | NAV | Private equity | | |
Assets: | | |
Investments, at fair value | 47,935 | $ 46,545 |
Fair Value, Measurements, Recurring | NAV | U.S. Treasury Securities | | |
Assets: | | |
Deposits with banks and short-term investments (a) | 0 | |
Fair Value, Measurements, Recurring | NAV | U.S. Treasury Securities | | |
Assets: | | |
Cash and cash equivalents | $ 0 | |