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Financial Guarantee Insurance Contracts Financial Guarantee Insurance Contracts - Summary of Percentage Ceded to Reinsurers and Reinsurance Recoverable and Rating Levels (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Insurance [Abstract]    
Loss Reserves Ceded To Reinsurers $ 100,355ambc_LossReservesCededToReinsurers $ 122,357ambc_LossReservesCededToReinsurers
Ceded Loss And Loss Expenses Paid Not Yet Recovered $ (517)ambc_CededLossAndLossExpensesPaidNotYetRecovered $ (1,108)ambc_CededLossAndLossExpensesPaidNotYetRecovered