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Financial Guarantee Insurance Contracts (Tables) | 9 Months Ended
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Sep. 30, 2013
Insurance [Abstract] |
Summary of Gross Premium Receivable Roll-Forward (Direct and Assumed Contracts) | Below is the gross premium receivable roll-forward (direct and assumed contracts) for the affected periods:
|  | Successor Ambac |  |  |  |  | Predecessor Ambac |
|  | Period from May 1 through September 30, 2013 |  |  |  |  | Period from January 1 through April 30, 2013 |  |  | Period from January 1 through December 31, 2012 |
Beginning premium receivable |  | $ | 1,531,631 |  |  |  |  | $ | 1,620,621 |  |  | $ | 2,028,479 |
Premium payments received |  |  | (49,940 | ) |  |  |  |  | (48,296 | ) |  |  | (155,626 | )
Adjustments for changes in expected life of homogeneous pools and actual changes to contractual cash flows |  |  | (70,900 | ) |  |  |  |  | (28,237 | ) |  |  | (299,906 | )
Accretion of premium receivable discount |  |  | 17,232 |  |  |  |  |  | 14,740 |  |  |  | 50,407 |
Uncollectible premiums |  |  | (14,800 | ) |  |  |  |  | (634 | ) |  |  | (28,031 | )
Other adjustments (including foreign exchange) |  |  | 22,787 |  |  |  |  |  | (26,563 | ) |  |  | 25,298 |
Ending premium receivable |  | $ | 1,436,010 |  |  |  |  | $ | 1,531,631 |  |  | $ | 1,620,621 |
Effect of Reinsurance on Premiums Written and Earned | The effect of reinsurance on premiums written and earned was as follows:
|  | Successor Ambac |  |  |  |  | Predecessor Ambac |
|  | Three months ended September 30, 2013 |  |  |  |  | Three Months Ended September 30, 2012 |
|  | Written |  |  | Earned |  |  |  |  | Written |  |  | Earned |
Direct |  | ($ | 34,380 | ) |  | $ | 73,997 |  |  |  |  | ($ | 55,310 | ) |  | $ | 117,864 |
Assumed |  |  | — |  |  |  | 24 |  |  |  |  |  | — |  |  |  | 25 |
Ceded |  |  | (4,017 | ) |  |  | 3,072 |  |  |  |  |  | (2,082 | ) |  |  | 4,815 |
Net premiums |  | ($ | 30,363 | ) |  | $ | 70,949 |  |  |  |  | ($ | 53,228 | ) |  | $ | 113,074 |
|  | Successor Ambac |  |  |  |  | Predecessor Ambac |
|  | Five Months Ended September 30, 2013 |  |  |  |  | Four Months Ended April 30, 2013 |  |  | Nine Months Ended September 30, 2012 |
|  | Written |  |  | Earned |  |  |  |  | Written |  |  | Earned |  |  | Written |  |  | Earned |
Direct |  | ($ | 68,461 | ) |  | $ | 136,029 |  |  |  |  | ($ | 14,125 | ) |  | $ | 138,468 |  |  | ($ | 175,777 | ) |  | $ | 323,658 |
Assumed |  |  | — |  |  |  | 40 |  |  |  |  |  | — |  |  |  | 32 |  |  |  | — |  |  |  | 118 |
Ceded |  |  | (7,055 | ) |  |  | 7,081 |  |  |  |  |  | (1,098 | ) |  |  | 8,500 |  |  |  | (18,055 | ) |  |  | 12,710 |
Net premiums |  | ($ | 61,406 | ) |  | $ | 128,988 |  |  |  |  | ($ | 13,027 | ) |  | $ | 130,000 |  |  | ($ | 157,722 | ) |  | $ | 311,066 |
Summarized Future Gross Undiscounted Premiums Expected to be Collected and Future Expected Premiums Earned, Net of Reinsurance | The table below summarizes the future gross undiscounted premiums expected to be collected, and future expected premiums earned, net of reinsurance by Successor Ambac at September 30, 2013:
|  | Future premiums expected to be collected (1) |  |  | Future expected premiums to be earned, net of reinsurance (1) |
Three months ended: |  |  |  |  |  |  |  |
December 31, 2013 |  | $ | 33,020 |  |  | $ | 51,560 |
Twelve months ended: |  |  |  |  |  |  |  |
December 31, 2014 |  |  | 125,309 |  |  |  | 186,459 |
December 31, 2015 |  |  | 125,159 |  |  |  | 167,106 |
December 31, 2016 |  |  | 118,632 |  |  |  | 154,135 |
December 31, 2017 |  |  | 112,526 |  |  |  | 143,323 |
Five years ended: |  |  |  |  |  |  |  |
December 31, 2022 |  |  | 497,121 |  |  |  | 591,581 |
December 31, 2027 |  |  | 392,615 |  |  |  | 414,028 |
December 31, 2032 |  |  | 277,704 |  |  |  | 257,483 |
December 31, 2037 |  |  | 131,553 |  |  |  | 124,457 |
December 31, 2042 |  |  | 48,449 |  |  |  | 42,002 |
December 31, 2047 |  |  | 14,564 |  |  |  | 14,429 |
December 31, 2052 |  |  | 3,639 |  |  |  | 4,692 |
December 31, 2057 |  |  | 92 |  |  |  | 296 |
Total |  | $ | 1,880,383 |  |  | $ | 2,151,551 |
(1) | The future premiums expected to be collected and future premiums expected to be earned, net of reinsurance disclosed in the above table relate to the discounted premium receivable asset and unearned premium liability recorded on Ambac’s balance sheet. The use of contractual lives for many bond types which do not have homogeneous pools of underlying collateral is required in the calculation of the premium receivable as described above, which results in a higher premium receivable balance than if expected lives were considered. If installment paying policies are retired early premiums reflected in the premium receivable asset and amounts reported in the above table for such policies may not be collected in the future.
Summary of Loss Reserve Roll-Forward, Net of Subrogation Recoverable and Reinsurance | Below is the loss reserve roll-forward, net of subrogation recoverable and reinsurance, for the affected periods:
|  | Successor Ambac |  |  |  |  |  |  | Predecessor Ambac |
|  | Period from May 1 through September 30, 2013 |  |  |  |  |  |  | Period from January 1 through April 30, 2013 |  |  | Period from January 1 through December 31, 2012 |
Beginning balance of loss and loss expense reserves, net of subrogation recoverable and reinsurance |  | $ | 5,434,517 |  |  |  |  |  |  | $ | 5,974,731 |  |  | $ | 6,230,780 |
Changes in the loss and loss expense reserves due to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current year: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Establishment of new loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance |  |  | 47,838 |  |  |  |  |  |  |  | 2,748 |  |  |  | 464,058 |
Claim and loss expense payments, net of subrogation and reinsurance |  |  | (163 | ) |  |  |  |  |  |  | (58 | ) |  |  | (20,765 | )
Establishment of RMBS subrogation recoveries, net of reinsurance |  |  | (315 | ) |  |  |  |  |  |  | (159 | ) |  |  | — |
Total current year |  |  | 47,360 |  |  |  |  |  |  |  | 2,531 |  |  |  | 443,293 |
Prior years: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in previously established loss and loss expense reserves, gross of RMBS subrogation and net of reinsurance |  |  | (322,165 | ) |  |  |  |  |  |  | (52,642 | ) |  |  | 72,700 |
Claim and loss (payments) recoveries, net of subrogation and reinsurance |  |  | (2,376 | ) |  |  |  |  |  |  | 20,902 |  |  |  | (944,860 | )
Change in previously established RMBS subrogation recoveries, net of reinsurance |  |  | 119,294 |  |  |  |  |  |  |  | (12,596 | ) |  |  | 172,818 |
Total prior years |  |  | (205,247 | ) |  |  |  |  |  |  | (44,336 | ) |  |  | (699,342 | )
Net change in loss and loss expense reserves |  |  | (157,887 | ) |  |  |  |  |  |  | (41,805 | ) |  |  | (256,049 | )
Net consolidation of certain VIE’s |  |  | — |  |  |  |  |  |  |  | (498,409 | ) |  |  | — |
Ending loss and loss expense reserves, net of subrogation recoverable and reinsurance |  | $ | 5,276,630 |  |  |  |  |  |  | $ | 5,434,517 |  |  | $ | 5,974,731 |
Summary of Information Related to Policies Currently Included in Ambac's Loss Reserves or Subrogation Recoverable | The tables below summarize information related to policies currently included in Ambac’s loss reserves or subrogation recoverable at September 30, 2013 and December 31, 2012. The weighted average risk-free rate used to discount loss reserves at September 30, 2013 and December 31, 2012 was 2.9% and 1.6%, respectively. Successor Ambac – Surveillance Categories (at September 30, 2013)
|  | I/SL |  |  | IA |  |  | II |  |  | III |  |  | IV |  |  | V |  |  | Total |
Number of policies |  |  | 18 |  |  |  | 43 |  |  |  | 27 |  |  |  | 76 |  |  |  | 144 |  |  |  | 1 |  |  |  | 309 |
Remaining weighted-average contract period (in years) |  |  | 13 |  |  |  | 16 |  |  |  | 19 |  |  |  | 18 |  |  |  | 10 |  |  |  | 6 |  |  |  | 13 |
Gross insured contractual payments outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal |  | $ | 849,629 |  |  | $ | 2,185,961 |  |  | $ | 2,112,936 |  |  | $ | 5,676,583 |  |  | $ | 11,491,293 |  |  | $ | 47 |  |  | $ | 22,316,449 |
Interest |  |  | 531,290 |  |  |  | 1,736,991 |  |  |  | 653,033 |  |  |  | 2,360,215 |  |  |  | 2,406,091 |  |  |  | 18 |  |  |  | 7,687,638 |
Total |  | $ | 1,380,919 |  |  | $ | 3,922,952 |  |  | $ | 2,765,969 |  |  | $ | 8,036,798 |  |  | $ | 13,897,384 |  |  | $ | 65 |  |  | $ | 30,004,087 |
Gross undiscounted claim liability |  | $ | 8,053 |  |  | $ | 82,907 |  |  | $ | 112,807 |  |  | $ | 2,857,566 |  |  | $ | 8,072,462 |  |  | $ | 65 |  |  | $ | 11,133,860 |
Discount, gross claim liability |  |  | (1,157 | ) |  |  | (8,757 | ) |  |  | (19,038 | ) |  |  | (1,143,340 | ) |  |  | (1,068,635 | ) |  |  | (4 | ) |  |  | (2,240,931 | )
Gross claim liability before all subrogation and before reinsurance |  | $ | 6,896 |  |  | $ | 74,150 |  |  | $ | 93,769 |  |  | $ | 1,714,226 |  |  | $ | 7,003,827 |  |  | $ | 61 |  |  | $ | 8,892,929 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross RMBS subrogation (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,139 | ) |  |  | (2,366,105 | ) |  |  | — |  |  |  | (2,371,244 | )
Discount, RMBS subrogation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 14 |  |  |  | 9,374 |  |  |  | — |  |  |  | 9,388 |
Discounted RMBS subrogation, before reinsurance |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (5,125 | ) |  |  | (2,356,731 | ) |  |  | — |  |  |  | (2,361,856 | )
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross other subrogation (2) |  |  | — |  |  |  | — |  |  |  | (17,834 | ) |  |  | (106,799 | ) |  |  | (717,871 | ) |  |  | — |  |  |  | (842,504 | )
Discount, other subrogation |  |  | — |  |  |  | — |  |  |  | 7,868 |  |  |  | 30,060 |  |  |  | 38,522 |  |  |  | — |  |  |  | 76,450 |
Discounted other subrogation, before reinsurance |  |  | — |  |  |  | — |  |  |  | (9,966 | ) |  |  | (76,739 | ) |  |  | (679,349 | ) |  |  | — |  |  |  | (766,054 | )
Gross claim liability, net of all subrogation and discounts, before reinsurance |  | $ | 6,896 |  |  | $ | 74,150 |  |  | $ | 83,803 |  |  | $ | 1,632,362 |  |  | $ | 3,967,747 |  |  | $ | 61 |  |  | $ | 5,765,019 |
Less: Unearned premium reserves |  |  | (4,306 | ) |  |  | (43,904 | ) |  |  | (61,877 | ) |  |  | (282,949 | ) |  |  | (98,255 | ) |  |  | — |  |  |  | (491,291 | )
Plus: Loss adjustment expenses reserves |  |  | — |  |  |  | 86 |  |  |  | 1,778 |  |  |  | 2,469 |  |  |  | 121,994 |  |  |  | — |  |  |  | 126,327 |
Claim liability reported on Balance Sheet, before reinsurance (3) |  | $ | 2,590 |  |  | $ | 30,332 |  |  | $ | 23,704 |  |  | $ | 1,351,882 |  |  | $ | 3,991,486 |  |  | $ | 61 |  |  | $ | 5,400,055 |
Reinsurance recoverable reported on Balance Sheet |  | $ | 182 |  |  | $ | 2,699 |  |  | $ | 2,742 |  |  | $ | 118,493 |  |  | $ | 13,284 |  |  | $ | — |  |  | $ | 137,400 |
(1) | RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for representation and warranty breaches.
(2) | Other subrogation represents subrogation, including subrogation from RMBS transactions, other than subrogation as defined in (1) above.
(3) | Claim liability reported on the Balance Sheet, before reinsurance is included in the Consolidated Balance Sheets as follows:
Losses and loss expense reserve (net of potential subrogation recoveries of $1,971,883) |  | $ | 5,884,660 |
Subrogation recoverable (includes gross potential recovery of $1,156,027) |  |  | (484,605 | )
|  | $ | 5,400,055 |
Predecessor Ambac – Surveillance Categories (at December 31, 2012)
|  | I/SL |  |  | IA |  |  | II |  |  | III |  |  | IV |  |  | V |  |  | Total |
Number of policies |  |  | 14 |  |  |  | 12 |  |  |  | 28 |  |  |  | 114 |  |  |  | 147 |  |  |  | 1 |  |  |  | 316 |
Remaining weighted-average contract period (in years) |  |  | 15 |  |  |  | 21 |  |  |  | 18 |  |  |  | 20 |  |  |  | 8 |  |  |  | 6 |  |  |  | 13 |
Gross insured contractual payments outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal |  | $ | 311,157 |  |  | $ | 786,998 |  |  | $ | 1,245,793 |  |  | $ | 9,161,747 |  |  | $ | 12,554,628 |  |  | $ | 47 |  |  | $ | 24,060,370 |
Interest |  |  | 166,276 |  |  |  | 715,129 |  |  |  | 379,237 |  |  |  | 4,905,775 |  |  |  | 3,076,746 |  |  |  | 20 |  |  |  | 9,243,183 |
Total |  | $ | 477,433 |  |  | $ | 1,502,127 |  |  | $ | 1,625,030 |  |  | $ | 14,067,522 |  |  | $ | 15,631,374 |  |  | $ | 67 |  |  | $ | 33,303,553 |
Gross undiscounted claim liability |  | $ | 2,135 |  |  | $ | 40,898 |  |  | $ | 49,521 |  |  | $ | 4,051,076 |  |  | $ | 7,976,765 |  |  | $ | 67 |  |  | $ | 12,120,462 |
Discount, gross claim liability |  |  | (219 | ) |  |  | (3,532 | ) |  |  | (3,247 | ) |  |  | (1,342,910 | ) |  |  | (788,720 | ) |  |  | (3 | ) |  |  | (2,138,631 | )
Gross claim liability before all subrogation and before reinsurance |  | $ | 1,916 |  |  | $ | 37,366 |  |  | $ | 46,274 |  |  | $ | 2,708,166 |  |  | $ | 7,188,045 |  |  | $ | 64 |  |  | $ | 9,981,831 |
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross RMBS subrogation (1) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (16,170 | ) |  |  | (2,544,993 | ) |  |  | — |  |  |  | (2,561,163 | )
Discount, RMBS subrogation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 312 |  |  |  | 37,626 |  |  |  | — |  |  |  | 37,938 |
Discounted RMBS subrogation, before reinsurance |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (15,858 | ) |  |  | (2,507,367 | ) |  |  | — |  |  |  | (2,523,225 | )
Less: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross other subrogation (2) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (141,012 | ) |  |  | (766,717 | ) |  |  | — |  |  |  | (907,729 | )
Discount, other subrogation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 21,238 |  |  |  | 15,711 |  |  |  | — |  |  |  | 36,949 |
Discounted other subrogation, before reinsurance |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (119,774 | ) |  |  | (751,006 | ) |  |  | — |  |  |  | (870,780 | )
Gross claim liability, net of all subrogation and discounts, before reinsurance |  | $ | 1,916 |  |  | $ | 37,366 |  |  | $ | 46,274 |  |  | $ | 2,572,534 |  |  | $ | 3,929,672 |  |  | $ | 64 |  |  | $ | 6,587,826 |
Less: Unearned premium reserves |  |  | (1,179 | ) |  |  | (21,626 | ) |  |  | (17,120 | ) |  |  | (450,247 | ) |  |  | (113,622 | ) |  |  | — |  |  |  | (603,794 | )
Plus: Loss adjustment expenses reserves |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 138,108 |  |  | $ | — |  |  | $ | 138,108 |
Claim liability reported on Balance Sheet, before reinsurance (3) |  | $ | 737 |  |  | $ | 15,740 |  |  | $ | 29,154 |  |  | $ | 2,122,287 |  |  | $ | 3,954,158 |  |  | $ | 64 |  |  | $ | 6,122,140 |
Reinsurance recoverable reported on Balance Sheet |  | $ | — |  |  | $ | 1,078 |  |  | $ | 7,085 |  |  | $ | 128,333 |  |  | $ | 22,590 |  |  | $ | — |  |  | $ | 159,086 |
(1) | RMBS subrogation represents Ambac’s estimate of subrogation recoveries from RMBS transaction sponsors for representation and warranty breaches.
(2) | Other subrogation represents subrogation, including subrogation from RMBS transactions, other than subrogation as defined in (1) above.
(3) | Claim liability reported on the Balance Sheet, before reinsurance is included in the Consolidated Balance Sheets as follows:
Losses and loss expense reserve (net of potential subrogation recoveries of $2,611,430) |  | $ | 6,619,486 |
Subrogation recoverable (includes gross potential recovery of $782,575) |  |  | (497,346 | )
|  | $ | 6,122,140 |
Summary of Balance of Subrogation Recoveries and Related Claim Liabilities, by Estimation Approach | The balance of RMBS subrogation recoveries and the related claim liabilities, by estimation approach, at September 30, 2013 and December 31, 2012, are as follows:
|  | Successor Ambac – September 30, 2013 |
Approach |  | Count |  |  | Gross loss reserve before subrogation recoveries |  |  | Subrogation recoveries (1) (2) |  |  | Gross loss reserve after subrogation recoveries |
Adverse samples |  |  | 27 |  |  | $ | 2,235,026 |  |  | $ | (1,404,088 | ) |  | $ | 830,938 |
Random samples |  |  | 21 |  |  |  | 1,096,081 |  |  |  | (957,768 | ) |  |  | 138,313 |
Totals |  |  | 48 |  |  | $ | 3,331,107 |  |  | $ | (2,361,856 | ) |  | $ | 969,251 |
|  | Predecessor Ambac – December 31, 2012 |
Approach |  | Count |  |  | Gross loss reserve before subrogation recoveries |  |  | Subrogation recoveries (1) (2) |  |  | Gross loss reserve after subrogation recoveries |
Adverse samples |  |  | 27 |  |  | $ | 2,331,878 |  |  | $ | (1,442,817 | ) |  | $ | 889,061 |
Random samples |  |  | 22 |  |  |  | 1,231,466 |  |  |  | (1,080,408 | ) |  |  | 151,058 |
Totals |  |  | 49 |  |  | $ | 3,563,344 |  |  | $ | (2,523,225 | ) |  | $ | 1,040,119 |
(1) | The amount of recorded subrogation recoveries related to each securitization is limited to ever-to-date paid losses plus projected paid losses for each policy. To the extent significant losses have been paid but not yet recovered, the recorded amount of RMBS subrogation recoveries may exceed the expected future claims for a given policy. The net cash inflow for these policies is recorded as a “Subrogation recoverable” asset. For those transactions where the subrogation recovery is less than expected future claims, the net cash outflow for these policies is recorded as a “Losses and loss expense reserve” liability.
(2) | The sponsor’s repurchase obligation may differ depending on the terms of the particular transaction and the status of the specific loan, such as whether it is performing or has been liquidated or charged off. The estimated subrogation recovery for these transactions is based primarily on loan level data provided through trustee reports received in the normal course of our surveillance activities or provided by the sponsor. While this data may not include all the components of the sponsor’s contractual repurchase obligation we believe it is the best information available to estimate the subrogation recovery.
Summary of Rollforward of RMBS Subrogation, by Estimation Approach | Below is the rollforward of RMBS subrogation, by estimation approach, for the affected periods:
|  | Random sample |  |  | Number of transactions |  |  | Adverse sample |  |  | Number of transactions |  |  | Total |
Successor Ambac: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted RMBS subrogation (gross of reinsurance) at May 1, 2013 |  | $ | 1,004,252 |  |  |  | 20 |  |  | $ | 1,478,666 |  |  |  | 29 |  |  |  | 2,482,918 |
Changes recognized through September 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional transactions reviewed |  |  | 2,426 |  |  |  | 1 |  |  |  | — |  |  |  | n/a |  |  |  | 2,426 |
Additional adverse sample loans reviewed |  |  | — |  |  |  | n/a |  |  |  | — |  |  |  | n/a |  |  |  | — |
Impact of sponsor actions (1) |  |  | — |  |  |  | n/a |  |  |  | — |  |  |  | n/a |  |  |  | — |
All other changes (2) |  |  | (48,910 | ) |  |  | n/a |  |  |  | (74,578 | ) |  |  | (2 | ) |  |  | (123,488 | )
Discounted RMBS subrogation (gross of reinsurance) at September 30, 2013 |  | $ | 957,768 |  |  |  | 21 |  |  | $ | 1,404,088 |  |  |  | 27 |  |  | $ | 2,361,856 |
Predecessor Ambac |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted RMBS subrogation (gross of reinsurance) at December 31, 2012 |  | $ | 1,080,408 |  |  |  | 22 |  |  | $ | 1,442,817 |  |  |  | 27 |  |  | $ | 2,523,225 |
Changes recognized through April 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional transactions reviewed |  |  | — |  |  |  | n/a |  |  |  | — |  |  |  | n/a |  |  |  | — |
Additional adverse sample loans reviewed |  |  | — |  |  |  | n/a |  |  |  | — |  |  |  | n/a |  |  |  | — |
Impact of sponsor actions (1) |  |  | (54,195 | ) |  |  | n/a |  |  |  | — |  |  |  | n/a |  |  |  | (54,195 | )
All other changes (2) |  |  | (21,961 | ) |  |  | (2 | ) |  |  | 35,849 |  |  |  | 2 |  |  |  | 13,888 |
Discounted RMBS subrogation (gross of reinsurance) at April 30, 2013 |  | $ | 1,004,252 |  |  |  | 20 |  |  | $ | 1,478,666 |  |  |  | 29 |  |  | $ | 2,482,918 |
|  | Random sample |  |  | Number of transactions |  |  | Adverse sample |  |  | Number of transactions |  |  | Total |
Predecessor Ambac: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rollforward: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted RMBS subrogation (gross of reinsurance) at January 1, 2012 |  | $ | 1,262,794 |  |  |  | 16 |  |  | $ | 1,457,472 |  |  |  | 30 |  |  | $ | 2,720,266 |
Changes recognized in 2012: Additional transactions reviewed |  |  | 54,467 |  |  |  | 6 |  |  |  | (35,486 | ) |  |  | (1 | ) |  |  | 18,981 |
Additional adverse sample loans reviewed |  |  | — |  |  |  | n/a |  |  |  | — |  |  |  | — |  |  |  | — |
Adverse loans repurchased by the sponsor |  |  | — |  |  |  | n/a |  |  |  | 35 |  |  |  | — |  |  |  | 35 |
All other changes (1) |  |  | (236,853 | ) |  |  | n/a |  |  |  | 20,796 |  |  |  | (2 | ) |  |  | (216,057 | )
Discounted RMBS subrogation (gross of reinsurance) at December 31, 2012 |  | $ | 1,080,408 |  |  |  | 22 |  |  | $ | 1,442,817 |  |  |  | 27 |  |  | $ | 2,523,225 |
(1) | Sponsor actions include loan repurchases, direct payments to Ambac, and other contributions from sponsors.
(2) | Other changes which may impact RMBS subrogation recoveries include changes in actual or projected collateral performance, changes in the creditworthiness of a sponsor, and/or the projected timing of recoveries. For the five months ended September 30, 2013, Successor Ambac added 1 transaction to the Random Sample subrogation population and removed 2 transactions from the Adverse Sample subrogation population; however, the impacts on RMBS subrogation disclosed in the Random Sample column relate to that, as well as other transactions. For the four months ended April 30, 2013, Predecessor Ambac transferred 2 transactions from the Random Sample population to the Adverse Sample population; however, the impacts on RMBS subrogation disclosed in the Adverse Sample column relate to those, as well as other transactions.

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