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ACCOUNTING POLICIES AND SUPPLEMENTAL DISCLOSURES - Valuation Technique And Significant Unobservable Inputs Of Equity Securities (Details) $ in Thousands | Dec. 31, 2023 USD ($) yr | Dec. 31, 2022 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | $ 41,046 | $ 82,823
Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | 41,000 |
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | 41,046 | $ 82,787
Level 3 | Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | 41,046 |
tZERO | Level 3 | Fair Value, Recurring | Term to liquidity | Market approach - transaction backsolve with an option pricing model |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | $ 37,126 |
Inputs | yr | 5 |
tZERO | Level 3 | Fair Value, Recurring | Volatility | Market approach - transaction backsolve with an option pricing model |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Inputs | yr | 1.25 |
tZERO | Level 3 | Fair Value, Recurring | Percentage change in enterprise value for guideline public companies | Market approach - transaction backsolve with an option pricing model |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Inputs | yr | 0.078 |
SpeedRoute | Level 3 | Fair Value, Recurring | Market approach - recent transactions |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | $ 3,920 |

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