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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, unless otherwise specified | Total | Successor Ambac [Member] | Successor Ambac [Member] Accumulated Deficit [Member] | Successor Ambac [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Successor Ambac [Member] Preferred Stock [Member] | Successor Ambac [Member] Common Stock [Member] | Successor Ambac [Member] Additional Paid-in Capital [Member] | Successor Ambac [Member] Treasury Stock [Member] | Successor Ambac [Member] Noncontrolling Interest [Member] | Predecessor Ambac [Member] | Predecessor Ambac [Member] Accumulated Deficit [Member] | Predecessor Ambac [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Predecessor Ambac [Member] Preferred Stock [Member] | Predecessor Ambac [Member] Common Stock [Member] | Predecessor Ambac [Member] Additional Paid-in Capital [Member] | Predecessor Ambac [Member] Treasury Stock [Member] | Predecessor Ambac [Member] Noncontrolling Interest [Member]
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Beginning balance at Jun. 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income |  | $ 324,682 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2013 |  | 886,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2012 |  |  |  |  |  |  |  |  |  | (3,246,967) | (6,297,264) | 625,385 | 0 | 3,080 | 2,172,027 | (410,755) | 660,560
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income |  |  |  |  |  |  |  |  |  | 3,522,382 | 3,349,049 | 174,875 | 0 | 0 | 0 | 0 | (1,542)
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  |  | (60) | (60) | 0 | 0 | 0 | 0 | 0 | 0
Shares issued under equity plans |  |  |  |  |  |  |  |  |  | 60 | 0 | 0 | 0 | 0 | 0 | 60 | 0
Temporary Equity, Elimination as Part of Reorganization |  |  |  |  |  |  |  |  |  | 0 | 2,948,275 | (800,260) | 0 | (3,080) | (2,172,027) | 410,695 | (383,603)
Ending balance at Apr. 30, 2013 |  | 460,415 | 0 | 0 | 0 | 450 | 184,550 | 0 | 275,415 | 275,415 | 0 | 0 | 0 | 0 | 0 | 0 | 275,415
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income |  | 426,319 | 436,656 | (10,246) | 0 | 0 | 0 | 0 | (91) |  |  |  |  |  |  |  |
Warrants exercised |  | 16 | 0 | 0 | 0 | 0 | 16 | 0 | 0 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2013 |  | 886,750 | 436,656 | (10,246) | 0 | 450 | 184,566 | 0 | 275,324 |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2013 | 978,422 | 978,422 | 505,219 | 11,661 | 0 | 450 | 185,672 | (19) | 275,439 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income |  | 269,292 | 30,487 | 239,204 | 0 | 0 | 0 | 0 | (399) |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 2,960 | 0 | 0 | 0 | 0 | 2,960 | 0 | 0 |  |  |  |  |  |  |  |
Shares issued under equity plans |  | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |
Warrants exercised |  | 16 | 0 | 0 | 0 | 0 | 16 | 0 | 0 |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2014 | 1,250,690 | 1,250,690 | 535,706 | 250,865 | 0 | 450 | 188,648 | (19) | 275,040 |  |  |  |  |  |  |  |
Beginning balance at Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income |  | 26,571 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Sep. 30, 2014 | $ 1,250,690 | $ 1,250,690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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