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Long-term Debt (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying value of Long-term debt
Long-term debt	$ 144,036	$ 223,601
Variable Interest Entity [Member]
Carrying value of Long-term debt
Long-term debt	14,376,872	14,288,540
Ambac Assurance Corporation [Member]
Carrying value of Long-term debt
Long-term debt	144,036	223,601
5.1% surplus notes, general account, due 2020 [Member] \| Ambac Assurance Corporation [Member]
Carrying value of Long-term debt
Long-term debt	133,820	213,790
5.1% surplus notes, segregated account, due 2020 [Member] \| Ambac Assurance Corporation [Member]
Carrying value of Long-term debt
Long-term debt	6,233	6,020
5.1% junior surplus notes, segregated account, due 2020 [Member] \| Ambac Assurance Corporation [Member]
Carrying value of Long-term debt
Long-term debt	$ 3,983	$ 3,791

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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