DISCONTINUED OPERATION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2021	Dec. 31, 2025	Oct. 31, 2025	Jun. 04, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Preferred stock, shares outstanding (in shares)			0		0
Nonredeemable noncontrolling interest			$ 197,755		$ 117,395
Long-term debt			0		117,558	$ 100,000
NOL allocated amount					1,690,842
Ambac Assurance Corporation | Discontinued Operations, Held-for-Sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate consideration							$ 420,000
Carrying amount of net assets held-for-sale			962,637		1,002,719
Loss on disposal	$ 570,145	$ 687,613	(570,145)	$ 0
U. S. Federal Net Operating Tax | Interest Expense
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
NOL allocated amount			110,494
Ambac Assurance [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
NOL allocated amount			$ 1,952,621
Secured Debt | Ambac UK
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt instrument, interest rate			0.00%
Long-term debt, gross					40,600
Long-term debt					$ 18,079
Debt discount amortization rate			7.40%