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DISCONTINUED OPERATION - Components of Anticiapted Loss on Sale (Details) - Ambac Assurance Corporation - Discontinued Operations, Held-for-Sale or Disposed of by Sale - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Fair value of net consideration to be received | $ 399,727 |  |
Less: estimated closing costs | (7,235) |  |
Fair value of net consideration to be received after estimated closing costs | 392,492 |  |
Carrying amount of net assets held-for-sale | 962,637 |  |
Loss on disposal | $ (570,145) | $ 0 | $ 0

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