Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Assets:
Available-for-sale Securities	$ 157,020	$ 135,224
Short-term Investments	127,601	200,510
Other Investments	28,294	18,317
Investments, Total	312,915	354,051
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	47,275	19,223
Restricted Cash	17,669	11,881
Premiums Receivable, Net	57,222	45,893
Receivables, Net, Current	55,377	9,419
Reinsurance Recoverables, Including Reinsurance Premium Paid	306,191	164,997
Deferred ceded premium	148,300	110,407
Deferred Policy Acquisition Cost	8,572	10,960
Derivative assets	0	656
Intangible assets, less accumulated amortization	344,775	61,403
Goodwill	418,234	69,694
Other assets	92,317	65,817
Disposal Group, Including Discontinued Operation, Assets	6,267,200	7,516,456
Total assets	8,058,378	8,428,320
Liabilities:
Unearned premiums	182,446	154,878
Liability for Claims and Claims Adjustment Expense	349,062	197,089
Ceded premiums payable	53,002	29,666
Capitalized Contract Cost, Net	7,500	5,777
Accrued Liabilities for Commissions, Expense and Taxes	71,431	6,932
Deferred Income Tax Liabilities, Net	70,135	0
Short-Term Debt	150,000
Accrued interest payable	2,560	0
Derivative liabilities	317	0
Other liabilities	89,036	60,419
Total liabilities held-for-sale	5,887,685	6,541,866
Liabilities	$ 6,862,857	$ 6,996,627
Preferred stock, shares outstanding (in shares)	0	0
Preferred stock, shares authorized	20,000,000	20,000,000
Stockholders’ equity:
Preferred Stock, Value, Issued	$ 0	$ 0
Common Stock, Value, Issued	489	467
Additional paid-in capital	331,007	291,761
Accumulated other comprehensive income (loss)	(188,436)	(160,047)
Retained earnings	742,185	1,246,048
Treasury Stock, Value	(28,339)	(16,573)
Total Ambac Financial Group, Inc. stockholders’ equity	856,906	1,361,656
Nonredeemable noncontrolling interest	197,755	52,958
Total stockholders’ equity	$ 1,054,661	$ 1,414,614
Preferred stock, par value	$ 0.01
Common stock, shares issued	48,875,167	46,659,144
Common stock, shares authorized	130,000,000	130,000,000
Redeemable Noncontrolling Interest, Equity, Carrying Amount	$ 140,860	$ 17,079
Total liabilities, redeemable noncontrolling interest and stockholders’ equity	$ 8,058,378	$ 8,428,320
Treasury Stock, Common, Shares	2,368,194	1,463,774
Fixed income securities, amortized cost	$ 289,712	$ 341,685
Fixed Income Securities [Member]
Stockholders’ equity:
Fixed income securities, amortized cost	162,124	141,179
Variable Interest Entity [Member]
Assets:
Restricted Cash	$ 47,275	$ 19,223