DISCONTINUED OPERATION - Assets and Liabilities Held-for-Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
ASSETS:
Total assets held-for-sale	$ 6,267,200	$ 7,516,456	$ 7,291,949
LIABILITIES:
Total liabilities held-for-sale	5,887,685	6,541,866
Ambac Assurance Corporation | Discontinued Operations, Held-for-Sale or Disposed of by Sale
ASSETS:
Total investments	2,226,505	2,309,967
Cash and equivalents	8,322	9,152
Premiums receivable	217,096	243,710
Reinsurance recoverable on paid and unpaid losses	25,274	29,518
Deferred ceded premiums	79,074	93,264
Subrogation recoverable	113,962	137,219
Intangible assets	213,457	245,133
Other assets, net	49,396	54,091
Restricted cash	57,754	246,031
VIE assets (including restricted cash of $57,754 and $246,031)	3,904,259	4,394,402
Valuation allowance on assets held-for-sale	(570,145)	0
Total assets held-for-sale	6,267,200	7,516,456
LIABILITIES:
Unearned premiums	228,177	266,727
Loss and loss adjustment reserves	577,167	695,859
Ceded premiums payable	56,404	60,627
Long-term debt and accrued interest	1,046,658	983,069
Other liabilities, net	105,772	131,294
VIE liabilities	3,873,507	4,404,290
Total liabilities held-for-sale	$ 5,887,685	$ 6,541,866