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Schedule I - Summary Of Investments Other Than Investments In Related Parties (Debtor-In-Possession) | 12 Months Ended
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Dec. 31, 2011
Schedule I - Summary Of Investments Other Than Investments In Related Parties [Abstract] |
Schedule I - Summary Of Investments Other Than Investments In Related Parties | AMBAC FINANCIAL GROUP, INC. AND SUBSIDIARIES DEBTOR-IN-POSSESSION SCHEDULE I - SUMMARY OF INVESTMENTS Other Than Investments in Related Parties December 31, 2011 (Dollar Amounts in Thousands)
Type of Investment |  | Amortized Cost |  |  | Estimated Fair Value |  |  | Amount at which shown in the balance sheet |
U.S. government obligations |  | $ | 367,118 |  |  | $ | 372,364 |  |  | $ | 372,364 |
U.S. agency obligations |  |  | 80,960 |  |  |  | 86,871 |  |  |  | 86,871 |
Municipal obligations |  |  | 1,858,493 |  |  |  | 2,002,999 |  |  |  | 2,002,999 |
Residential mortgage-backed securities |  |  | 1,122,074 |  |  |  | 1,415,245 |  |  |  | 1,415,245 |
Collateralized debt obligations |  |  | 48,686 |  |  |  | 46,237 |  |  |  | 46,237 |
Other asset-backed securities |  |  | 953,944 |  |  |  | 947,808 |  |  |  | 947,808 |
Corporate obligations |  |  | 1,087,629 |  |  |  | 1,127,500 |  |  |  | 1,127,500 |
Foreign obligations |  |  | 89,951 |  |  |  | 94,795 |  |  |  | 94,795 |
Short-term |  |  | 783,015 |  |  |  | 783,071 |  |  |  | 783,071 |
Other |  |  | 100 |  |  |  | 100 |  |  |  | 100 |
Total |  | $ | 6,391,970 |  |  | $ | 6,876,990 |  |  | $ | 6,876,990 |

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- Definition The entire disclosure for the information required in the supplementary schedule applicable to management investment companies summarizing the listing of holdings of unaffiliated investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C) -URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Article 12 + Details
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