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FAIR VALUE MEASUREMENTS (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Investments in securities: |  |  |  |  |  |  |  |
Investments in trading securities | $ 20,364,000 |  | $ 20,364,000 |  |  | $ 32,674,000 |  |
Total assets measured at fair value | 22,189,000 |  | 22,189,000 |  |  | 32,915,000 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |  |
Beginning balance |  | $ 2,792,000 |  | $ 2,792,000 |  |  |  |
Ending balance |  | 0 |  | 0 |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales |  | (2,792,000) |  | (2,792,000) |  |  |  |
Fair Value Inputs [Abstract] (Deprecated 2018-01-31) |  |  |  |  |  |  |  |
Long-term Investments | 8,747,000 |  | 8,747,000 |  |  | 7,247,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 10,176,000 | 7,763,000 | 10,176,000 | 7,763,000 | $ 7,184,000 | 10,133,000 | $ 11,841,000 | $ 12,901,000
Payment for Contingent Consideration Liability, Financing Activities | (1,815,000) |  | (1,815,000) |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings | $ 4,807,000 | $ (4,078,000) | $ 1,858,000 | $ (5,138,000) |  |  |  |
Unobservable input - revenue retention discount rate - maximum | true | true | true | true |  |  |  |
Unobservable input - revenue retention discount rate - weighted average | true | true | true | true |  |  |  |
Unobservable input - revenue retention discount rate - minimum | true | true | true | true |  |  |  |
Unobservable input - revenue retention volatility - weighted average | true | true | true | true |  |  |  |
Unobservable input - revenue retention volatility - maximum | true | true | true | true |  |  |  |
Unobservable input - revenue retention volatility - minimum | true | true | true | true |  |  |  |
Unobservable input - growth discount rate - weighted average | true | true | true | true |  |  |  |
Unobservable input - growth discount rate - maximum | true | true | true | true |  |  |  |
Unobservable input - growth discount rate - minimum | true | true | true | true |  |  |  |
Unobservable input - growth volatility - weighted average | true | true | true | true |  |  |  |
Unobservable input - growth volatility - maximum | true | true | true | true |  |  |  |
Unobservable input - growth volatility - minimum | true | true | true | true |  |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration |  |  | $ 10,200,000 |  |  |  |  |
Level 1 |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Investments in trading securities | $ 20,364,000 |  | 20,364,000 |  |  | 32,674,000 |  |
Total assets measured at fair value | 20,364,000 |  | 20,364,000 |  |  | 32,674,000 |  |
Level 2 |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Investments in trading securities | 0 |  | 0 |  |  | 0 |  |
Total assets measured at fair value | 0 |  | 0 |  |  | 0 |  |
Level 3 |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Investments in trading securities | 0 |  | 0 |  |  | 0 |  |
Total assets measured at fair value | $ 0 |  | $ 0 |  |  | $ 0 |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration | Level 3 |  | Level 3 |  |  | Level 3 |  |
Other Liabilities, Fair Value Disclosure | $ 10,176,000 |  | $ 10,176,000 |  |  | $ 10,133,000 |  |
Investments Measured at NAV |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Investments in trading securities | 0 |  | 0 |  |  | 0 |  |
Total assets measured at fair value | $ 1,825,000 |  | $ 1,825,000 |  |  | $ 241,000 |  |
Fair Value, Recurring |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Asset Acquisition, Consideration Transferred, Contingent Consideration | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] |  | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] |  |  | Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] |  |
Private investment funds |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Private | $ 1,825,000 |  | $ 1,825,000 |  |  | $ 241,000 |  |
Private investment funds | Level 1 |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Private | 0 |  | 0 |  |  | 0 |  |
Private investment funds | Level 2 |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Private | 0 |  | 0 |  |  | 0 |  |
Private investment funds | Level 3 |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Private | 0 |  | 0 |  |  | 0 |  |
Private investment funds | Investments Measured at NAV |  |  |  |  |  |  |  |
Investments in securities: |  |  |  |  |  |  |  |
Private | $ 1,825,000 |  | $ 1,825,000 |  |  | $ 241,000 |  |

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