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ACCOUNTING POLICIES - Valuation Technique And Significant Unobservable Inputs Of Equity Securities (Details) $ in Thousands | Dec. 31, 2022 USD ($) yr | Dec. 31, 2021 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | $ 82,823 | $ 102,529
Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | 82,800 |
Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | 82,787 | $ 102,355
Level 3 | Fair Value, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Equity securities, at fair value | 82,787 |
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 | $ 78,867 |
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 | (0.324) |
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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