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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2013 Successor Ambac [Member] | Dec. 31, 2012 Predecessor Ambac [Member] | Jun. 30, 2013 Variable Interest Entity [Member] Successor Ambac [Member] | Dec. 31, 2012 Variable Interest Entity [Member] Predecessor Ambac [Member]
--- | --- | --- | --- | ---
Fixed income securities, amortized cost | $ 5,676,216 | $ 4,751,824 |  |
Fixed income securities pledged as collateral, amortized cost | 164,340 | 265,517 |  |
Short-term investments, amortized cost | 611,174 | 661,219 |  |
Loans, fair value |  |  | 13,820,878 | 15,359,073
Long-term debt, fair value |  |  | $ 14,262,734 | $ 15,200,538
Preferred stock, par value | $ 0.01 | $ 0.01 |  |
Preferred stock, shares authorized | 20,000,000 | 4,000,000 |  |
Preferred stock, shares issued | 0 | 0 |  |
Preferred stock, shares outstanding | 0 | 0 |  |
Common stock, par value | $ 0.01 | $ 0.01 |  |
Common stock, shares authorized | 130,000,000 | 650,000,000 |  |
Common stock, shares issued | 45,002,456 | 308,016,674 |  |
Common stock, shares outstanding | 45,002,456 | 308,016,674 |  |
Treasury stock, shares |  | 5,580,657 |  |

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