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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share | The following table provides a reconciliation of the common shares used for basic earnings per share and diluted earnings per share:
|  | Successor Ambac |  |  | Predecessor Ambac |
|  | Eight months ended December 31, 2013 |  |  | Four months ended April 30, 2013 |  |  | Year Ended December 31, 2012 |
Weighted average number of common shares used for basic earnings per share |  |  | 45,003,925 |  |  |  | 302,469,544 |  |  |  | 302,468,867 |
Effect of potential dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  | 1,297,620 |  |  |  | — |  |  |  | — |
Restricted stock units |  |  | 1,189 |  |  |  | 109,701 |  |  |  | — |
Stock options |  |  | — |  |  |  | — |  |  |  | — |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share |  | $ | 46,302,734 |  |  | $ | 302,579,245 |  |  | $ | 302,468,867 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  | — |  |  |  | — |  |  |  | — |
Stock options |  |  | 855 |  |  |  | 475,550 |  |  |  | 805,999 |
Restricted stock units |  |  | — |  |  |  | — |  |  |  | 71,295 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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