Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets:
Fixed income securities, at fair value	$ 3,048,000
Total investments (net of allowance for credit losses of $0 at September 30, 2020)	3,551,000	$ 3,792,000
Cash and cash equivalents	37,000	24,000
Restricted Cash	10,000	55,000
Premiums Receivable, Net	372,000	416,000
Reinsurance Recoverable, Allowance for Credit Loss	0
Reinsurance Recoverables, Including Reinsurance Premium Paid	37,000	26,000
Deferred ceded premium	73,000	82,000
Subrogation recoverable	2,194,000	2,029,000
Derivative assets	95,000	75,000
Income Taxes Receivable	2,000	11,000
Insurance intangible asset	383,000	427,000
Other assets	60,000	95,000
Total assets	12,812,000	13,320,000
Liabilities:
Unearned premiums	468,000	518,000
Loss and loss expense reserves	1,801,000	1,548,000
Ceded premiums payable	27,000	29,000
Long-term debt	2,737,000	2,822,000
Accrued interest payable	499,000	441,000
Derivative Liability	126,000	90,000
Other liabilities	91,000	93,000
Total liabilities	11,718,000	11,783,000
Stockholders’ equity:
Preferred stock, par value $0.01 per share; 20,000,000 shares authorized; issued and outstanding shares—none	0	0
Common Stock, Value, Issued	0	0
Additional paid-in capital	240,000	232,000
Accumulated other comprehensive income	22,000	42,000
Retained earnings	773,000	1,203,000
Treasury stock, shares at cost: 0 and 8,202	(1,000)	0
Total Ambac Financial Group, Inc. stockholders’ equity	1,035,000	1,477,000
Noncontrolling interest	60,000	60,000
Total stockholders’ equity	1,095,000	1,536,000
Total liabilities and stockholders’ equity	12,812,000	13,320,000
Deferred Income Tax Liabilities, Net	28,000	32,000
Available-for-sale Securities, Amortized Cost Basis	2,914,000	3,187,000
Short-term Investments [Member]
Assets:
Fixed income securities, at fair value	586,000	653,000
Stockholders’ equity:
Available-for-sale Securities, Amortized Cost Basis	586,000	653,000
Fixed Income Securities [Member]
Assets:
Fixed income securities, at fair value	2,311,000	2,577,000
Stockholders’ equity:
Available-for-sale Securities, Amortized Cost Basis	2,176,000	2,450,000
Available-for-sale Securities	2,311,000	2,577,000
Short-term Investments [Member]
Stockholders’ equity:
Available-for-sale Securities	586,000	653,000
Other Investments [Member]
Stockholders’ equity:
Available-for-sale Securities	502,000	478,000
Collateral Pledged [Member] | Short-term Investments [Member]
Assets:
Fixed income securities, at fair value		85,000
Collateral Pledged [Member] | Fixed Income Securities [Member]
Assets:
Fixed income securities, at fair value	152,000	85,000
Collateral Pledged [Member] | Fixed Income Securities [Member] | Short-term Investments [Member]
Assets:
Fixed income securities, at fair value	152,000
Stockholders’ equity:
Available-for-sale Securities, Amortized Cost Basis	152,000	85,000
Collateral Pledged [Member] | Short-term Investments
Stockholders’ equity:
Available-for-sale Securities, Amortized Cost Basis	152,000	85,000
Collateralized Securities | Short-term Investments [Member]
Stockholders’ equity:
Available-for-sale Securities	$ 152,000	$ 85,000