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
	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