Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	$ 3,476,694
Short-term investments, at fair value (amortized cost of $664,423 and $430,405)	664,441	$ 430,331
Other investments	462,427	391,217
Total investments	3,939,121	3,937,223
Cash and cash equivalents	51,951	63,089
Restricted Cash	12,561	19,405
Premium receivables	414,744	495,391
Reinsurance recoverable on paid and unpaid losses	26,036	23,133
Deferred ceded premium	76,495	61,134
Subrogation recoverable	2,082,268	1,932,960
Derivative assets	82,162	59,468
Income Taxes Receivable	19,663	47,040
Insurance intangible asset	433,524	718,931
Other assets	113,189	137,628
Total assets	13,451,104	14,588,711
Liabilities:
Unearned premiums	527,771	629,971
Loss and loss expense reserves	1,522,304	1,826,078
Ceded premiums payable	29,950	32,913
Long-term debt	2,954,929	2,928,929
Accrued interest payable	423,815	375,808
Derivative Liability	103,314	76,699
Other liabilities	95,267	63,792
Total liabilities	11,822,440	12,955,564
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	456	454
Additional paid-in capital	229,128	219,429
Accumulated other comprehensive income	26,407	(48,715)
Retained earnings	1,313,052	1,421,302
Treasury stock, shares at cost: 0 and 8,202	(347)	(473)
Total Ambac Financial Group, Inc. stockholders’ equity	1,568,696	1,591,997
Noncontrolling interest	59,968	41,150
Total stockholders’ equity	1,628,664	1,633,147
Total liabilities and stockholders’ equity	13,451,104	14,588,711
Deferred Income Tax Liabilities, Net	30,150	40,130
Variable Interest Entity, Primary Beneficiary [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	3,158,608	2,737,286
Restricted Cash	3,168	999
Derivative assets	67,921	66,302
Other assets	4,154	1,058
Total assets	6,199,390	7,093,309
Liabilities:
Long-term debt	4,353,171	5,268,596
Accrued interest payable	2,656	556
Derivative Liability	1,779,077	1,712,062
Other liabilities	36	30
Total liabilities	6,134,940	6,981,244
Stockholders’ equity:
Financing Receivable, after Allowance for Credit Loss	2,965,539	4,287,664
Fixed Income Securities [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	2,727,305	3,115,675
Collateral Pledged [Member] | Fixed Income Securities [Member]
Assets:
Fixed income securities, at fair value (amortized cost of $2,561,278 and $3,020,744)	$ 84,948	$ 0