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Investments (Tables) | 3 Months Ended
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Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract] |
Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments | The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2016 and December 31, 2015 were as follows:
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Non-credit other-than temporary Impairments (1)
March 31, 2016 |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 380,190 |  |  | $ | 10,609 |  |  | $ | 4,969 |  |  | $ | 385,830 |  |  | $ | — |
Corporate obligations |  | 1,626,276 |  |  | 27,929 |  |  | 7,901 |  |  | 1,646,304 |  |  | — |
Foreign obligations |  | 92,596 |  |  | 4,106 |  |  | 61 |  |  | 96,641 |  |  | — |
U.S. government obligations |  | 32,185 |  |  | 1,357 |  |  | 93 |  |  | 33,449 |  |  | — |
U.S. agency obligations |  | 4,195 |  |  | — |  |  | 9 |  |  | 4,186 |  |  | — |
Residential mortgage-backed securities |  | 2,229,764 |  |  | 103,842 |  |  | 59,551 |  |  | 2,274,055 |  |  | 43,928 |
Collateralized debt obligations |  | 100,949 |  |  | 59 |  |  | 1,667 |  |  | 99,341 |  |  | — |
Other asset-backed securities |  | 1,073,604 |  |  | 39,431 |  |  | 2,580 |  |  | 1,110,455 |  |  | — |
|  | 5,539,759 |  |  | 187,333 |  |  | 76,831 |  |  | 5,650,261 |  |  | 43,928 |
Short-term |  | 436,759 |  |  | 1 |  |  | — |  |  | 436,760 |  |  | — |
|  | 5,976,518 |  |  | 187,334 |  |  | 76,831 |  |  | 6,087,021 |  |  | 43,928 |
Fixed income securities pledged as collateral: |  |  |  |  |  |  |  |  |  |
U.S. government obligations |  | 64,667 |  |  | 251 |  |  | — |  |  | 64,918 |  |  | — |
Total collateralized investments |  | 64,667 |  |  | 251 |  |  | — |  |  | 64,918 |  |  | — |
Total available-for-sale investments |  | $ | 6,041,185 |  |  | $ | 187,585 |  |  | $ | 76,831 |  |  | $ | 6,151,939 |  |  | $ | 43,928 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 424,048 |  |  | $ | 4,910 |  |  | $ | 8,188 |  |  | $ | 420,770 |  |  | $ | — |
Corporate obligations |  | 1,610,912 |  |  | 7,089 |  |  | 24,332 |  |  | 1,593,669 |  |  | — |
Foreign obligations |  | 96,638 |  |  | 1,491 |  |  | 1,823 |  |  | 96,306 |  |  | — |
U.S. government obligations |  | 26,086 |  |  | 789 |  |  | 188 |  |  | 26,687 |  |  | — |
U.S. agency obligations |  | 4,239 |  |  | — |  |  | 27 |  |  | 4,212 |  |  | — |
Residential mortgage-backed securities |  | 1,942,285 |  |  | 99,670 |  |  | 64,617 |  |  | 1,977,338 |  |  | 41,673 |
Collateralized debt obligations |  | 85,706 |  |  | 42 |  |  | 1,481 |  |  | 84,267 |  |  | — |
Other asset-backed securities |  | 802,842 |  |  | 41,177 |  |  | 3,492 |  |  | 840,527 |  |  | — |
|  | 4,992,756 |  |  | 155,168 |  |  | 104,148 |  |  | 5,043,776 |  |  | 41,673 |
Short-term |  | 225,789 |  |  | 1 |  |  | 1 |  |  | 225,789 |  |  | — |
|  | 5,218,545 |  |  | 155,169 |  |  | 104,149 |  |  | 5,269,565 |  |  | 41,673 |
Fixed income securities pledged as collateral: |  |  |  |  |  |  |  |  |  |
U.S. government obligations |  | 64,612 |  |  | — |  |  | 57 |  |  | 64,555 |  |  | — |
Total collateralized investments |  | 64,612 |  |  | — |  |  | 57 |  |  | 64,555 |  |  | — |
Total available-for-sale investments |  | $ | 5,283,157 |  |  | $ | 155,169 |  |  | $ | 104,206 |  |  | $ | 5,334,120 |  |  | $ | 41,673 |
(1) | Represents the amount of non-credit other-than-temporary impairment losses remaining in accumulated other comprehensive loss on securities that also had a credit impairment. These losses are included in gross unrealized losses as of March 31, 2016 and December 31, 2015.
Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments Held by Successor Ambac, by Contractual Maturity | The amortized cost and estimated fair value of available-for-sale investments, excluding VIE investments, at March 31, 2016, by contractual maturity, were as follows:
|  | Amortized Cost |  | Estimated Fair Value
Due in one year or less |  | $ | 536,088 |  |  | $ | 536,300 |
Due after one year through five years |  | 1,061,175 |  |  | 1,070,684 |
Due after five years through ten years |  | 864,905 |  |  | 881,715 |
Due after ten years |  | 174,700 |  |  | 179,389 |
|  | 2,636,868 |  |  | 2,668,088 |
Residential mortgage-backed securities |  | 2,229,764 |  |  | 2,274,055 |
Collateralized debt obligations |  | 100,949 |  |  | 99,341 |
Other asset-backed securities |  | 1,073,604 |  |  | 1,110,455 |
Total |  | $ | 6,041,185 |  |  | $ | 6,151,939 |
Summary of Gross Unrealized Losses and Fair Values of Ambac's Available-for-Sale Investments | The following table shows gross unrealized losses and fair values of Ambac’s available-for-sale investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, at March 31, 2016 and December 31, 2015:
|  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 58,996 |  |  | $ | 1,587 |  |  | $ | 76,741 |  |  | $ | 3,382 |  |  | $ | 135,737 |  |  | $ | 4,969 |
Corporate obligations |  | 266,795 |  |  | 5,198 |  |  | 137,811 |  |  | 2,703 |  |  | 404,606 |  |  | 7,901 |
Foreign obligations |  | 1,838 |  |  | 17 |  |  | 1,556 |  |  | 44 |  |  | 3,394 |  |  | 61 |
U.S. government obligations |  | 7,903 |  |  | 73 |  |  | 8,436 |  |  | 20 |  |  | 16,339 |  |  | 93 |
U.S. agency obligations |  | — |  |  | — |  |  | 4,186 |  |  | 9 |  |  | 4,186 |  |  | 9 |
Residential mortgage-backed securities |  | 624,811 |  |  | 35,383 |  |  | 304,949 |  |  | 24,168 |  |  | 929,760 |  |  | 59,551 |
Collateralized debt obligations |  | 67,563 |  |  | 1,550 |  |  | 19,767 |  |  | 117 |  |  | 87,330 |  |  | 1,667 |
Other asset-backed securities |  | 409,620 |  |  | 2,540 |  |  | 15,345 |  |  | 40 |  |  | 424,965 |  |  | 2,580 |
|  | 1,437,526 |  |  | 46,348 |  |  | 568,791 |  |  | 30,483 |  |  | 2,006,317 |  |  | 76,831 |
Short-term |  | 1,983 |  |  | — |  |  | — |  |  | — |  |  | 1,983 |  |  | — |
|  | 1,439,509 |  |  | 46,348 |  |  | 568,791 |  |  | 30,483 |  |  | 2,008,300 |  |  | 76,831 |
Fixed income securities, pledged as collateral: |  |  |  |  |  |  |  |  |  |  |  |
U. S. government obligations |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total collateralized investments |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total temporarily impaired securities |  | $ | 1,439,509 |  |  | $ | 46,348 |  |  | $ | 568,791 |  |  | $ | 30,483 |  |  | $ | 2,008,300 |  |  | $ | 76,831 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total
|  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss |  | Fair Value |  | Gross Unrealized Loss
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 117,008 |  |  | $ | 2,070 |  |  | $ | 114,708 |  |  | $ | 6,118 |  |  | $ | 231,716 |  |  | $ | 8,188 |
Corporate obligations |  | 938,916 |  |  | 21,331 |  |  | 92,581 |  |  | 3,001 |  |  | 1,031,497 |  |  | 24,332 |
Foreign obligations |  | 34,904 |  |  | 1,018 |  |  | 8,584 |  |  | 805 |  |  | 43,488 |  |  | 1,823 |
U.S. government obligations |  | 2,938 |  |  | 18 |  |  | 10,658 |  |  | 170 |  |  | 13,596 |  |  | 188 |
U.S. agency obligations |  | — |  |  | — |  |  | 4,212 |  |  | 27 |  |  | 4,212 |  |  | 27 |
Residential mortgage-backed securities |  | 584,699 |  |  | 53,367 |  |  | 213,303 |  |  | 11,250 |  |  | 798,002 |  |  | 64,617 |
Collateralized debt obligations |  | 77,538 |  |  | 1,481 |  |  | — |  |  | — |  |  | 77,538 |  |  | 1,481 |
Other asset-backed securities |  | 450,690 |  |  | 3,456 |  |  | 19,274 |  |  | 36 |  |  | 469,964 |  |  | 3,492 |
|  | 2,206,693 |  |  | 82,741 |  |  | 463,320 |  |  | 21,407 |  |  | 2,670,013 |  |  | 104,148 |
Short-term |  | 9,982 |  |  | 1 |  |  | — |  |  | — |  |  | 9,982 |  |  | 1 |
|  | 2,216,675 |  |  | 82,742 |  |  | 463,320 |  |  | 21,407 |  |  | 2,679,995 |  |  | 104,149 |
Fixed income securities, pledged as collateral: |  |  |  |  |  |  |  |  |  |  |  |
U. S. government obligations |  | 64,555 |  |  | 57 |  |  | — |  |  | — |  |  | 64,555 |  |  | 57 |
Total collateralized investments |  | 64,555 |  |  | 57 |  |  | — |  |  | — |  |  | 64,555 |  |  | 57 |
Total temporarily impaired securities |  | $ | 2,281,230 |  |  | $ | 82,799 |  |  | $ | 463,320 |  |  | $ | 21,407 |  |  | $ | 2,744,550 |  |  | $ | 104,206 |
Summary of Amounts Included in Net Realized (Losses) Gains and Other-Than-Temporary Impairments | The following table details amounts included in net realized gains and other-than-temporary impairments included in earnings for the affected periods:
|  | Three Months Ended March 31,
|  | 2016 |  | 2015
Gross realized gains on securities |  | $ | 1,928 |  |  | $ | 50,654 |
Gross realized losses on securities |  | (3,609 | ) |  | (3,737 | )
Net foreign exchange gains |  | 2,783 |  |  | 7,184 |
Net realized gains |  | $ | 1,102 |  |  | $ | 54,101 |
Net other-than-temporary impairments (1) |  | $ | (9,334 | ) |  | $ | (3,119 | )
(1) | Other-than-temporary impairments exclude impairment amounts recorded in other comprehensive income under ASC Paragraph 320-10-65-1, which comprise non-credit related amounts on securities that are credit impaired but which management does not intend to sell and it is not more likely than not that Ambac will be required to sell before recovery of the amortized cost basis.
Summary of Roll-Forward of Ambac's Cumulative Credit Losses on Debt Securities for Which Portion of Other-than-Temporary Impairment was Recognized in Other Comprehensive Income | The following table presents a roll-forward of Ambac’s cumulative credit losses on debt securities held as of March 31, 2016 and 2015 for which a portion of an other-than-temporary impairment was recognized in other comprehensive income:
|  | Three Months Ended March 31,
|  | 2016 |  | 2015
Balance, beginning of period |  | $ | 31,176 |  |  | $ | 14,062 |
Additions for credit impairments recognized on: |  |  |  |
Securities not previously impaired |  | 580 |  |  | 1,660 |
Securities previously impaired |  | 8,756 |  |  | 1,457 |
Reductions for credit impairments previously recognized on: |  |  |  |
Securities that matured or were sold during the period |  | — |  |  | — |
Balance, end of period |  | $ | 40,512 |  |  | $ | 17,179 |
Summary of Sources of Collateral Received and Various Investment Agreement in which Collateral Pledged | The following table presents (i) the sources of collateral either received from various counterparties where Ambac is permitted to sell or re-pledge the collateral or collateral held directly in the investment portfolio and (ii) how that collateral was pledged to various investment agreements, derivative and repurchase agreement counterparties at March 31, 2016 and December 31, 2015:
|  | Fair Value of Cash and Underlying Securities |  | Fair Value of Cash and Securities Pledged to Investment Agreement Counterparties |  | Fair Value of Cash and Securities Pledged to Derivative Counterparties
March 31, 2016: |  |  |  |  |  |
Sources of Collateral: |  |  |  |  |  |
Cash and securities pledged directly from the investment portfolio |  | $ | 368,086 |  |  | $ | 108,367 |  |  | $ | 259,719 |
December 31, 2015: |  |  |  |  |  |
Sources of Collateral: |  |  |  |  |  |
Cash and securities pledged directly from the investment portfolio |  | $ | 338,007 |  |  | $ | 108,379 |  |  | $ | 229,628 |
Summary of Fair Value, Including Financial Guarantee, and Weighted-Average Underlying Rating, Excluding Financial Guarantee, of Insured Securities | The following table represents the fair value, including the value of the financial guarantee, and weighted-average underlying rating, excluding the financial guarantee, of the insured securities at March 31, 2016 and December 31, 2015, respectively:
|  | Municipal obligations |  | Corporate obligations |  | Mortgage and asset- backed securities |  | Short-term |  | Total |  | Weighted Average Underlying Rating (1)
March 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |
Ambac Assurance Corporation (2) |  | $ | 58,532 |  |  | $ | — |  |  | $ | 2,516,589 |  |  | $ | 55 |  |  | $ | 2,575,176 |  |  | CC
National Public Finance Guarantee Corporation |  | 45,850 |  |  | — |  |  | — |  |  | — |  |  | 45,850 |  |  | A-
Assured Guaranty Municipal Corporation |  | 29,788 |  |  | — |  |  | — |  |  | — |  |  | 29,788 |  |  | AA-
MBIA Insurance Corporation |  | — |  |  | 25,746 |  |  | — |  |  | — |  |  | 25,746 |  |  | A+
Total |  | $ | 134,170 |  |  | $ | 25,746 |  |  | $ | 2,516,589 |  |  | $ | 55 |  |  | $ | 2,676,560 |  |  | CC
December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Ambac Assurance Corporation (2) |  | $ | 60,836 |  |  | $ | — |  |  | $ | 2,216,317 |  |  | $ | — |  |  | $ | 2,277,153 |  |  | CC
National Public Finance Guarantee Corporation |  | 47,846 |  |  | — |  |  | — |  |  | — |  |  | 47,846 |  |  | A-
Assured Guaranty Municipal Corporation |  | 57,715 |  |  | — |  |  | — |  |  | — |  |  | 57,715 |  |  | A+
MBIA Insurance Corporation |  | — |  |  | 25,645 |  |  | — |  |  | — |  |  | 25,645 |  |  | A+
Total |  | $ | 166,397 |  |  | $ | 25,645 |  |  | $ | 2,216,317 |  |  | $ | — |  |  | $ | 2,408,359 |  |  | CCC-
(1) | Ratings are based on the lower of Standard & Poor’s or Moody’s rating. If unavailable, Ambac’s internal rating is used.
(2) | Includes asset-backed securities with a fair value of $118,968 and $119,802 at March 31, 2016 and December 31, 2015, insured by Ambac UK.
Summary of Net Investment Income | Net investment income was comprised of the following for the affected periods:
|  | Three Months Ended March 31,
|  | 2016 |  | 2015
Fixed income securities |  | $ | 59,426 |  |  | $ | 65,585 |
Short-term investments |  | 553 |  |  | 42 |
Loans |  | 106 |  |  | 132 |
Investment expense |  | (2,103 | ) |  | (2,427 | )
Securities available-for-sale and short-term |  | 57,982 |  |  | 63,332 |
Other investments |  | 2,839 |  |  | 9,651 |
Total net investment income |  | $ | 60,821 |  |  | $ | 72,983 |
Net investment income from Other investments primarily represents changes in fair value on securities classified as trading or under the fair value option plus income from Ambac's equity interest in an unconsolidated trust created in connection with its sale of Segregated Account junior surplus notes. The portion of net unrealized gains (losses) related to trading securities still held at the end of each period is as follows:
|  | Three Months Ended March 31,
|  | 2016 |  | 2015
Net gains (losses) recognized during the period on trading securities |  | $ | 1,707 |  |  | $ | 7,819 |
Less: net gains (losses) recognized during the reporting period on trading securities sold during the period |  | 406 |  |  | 1,564 |
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date |  | $ | 1,301 |  |  | $ | 6,255 |

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- Definition Tabular disclosure of the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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