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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2015
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 net income per share to the diluted shares used for diluted net income per share:
| Successor Ambac |  |  | Predecessor Ambac
|  |  |  |  | Period from May 1 |  |  | Period from Jan 1
| Year Ended December 31, |  | through |  |  | through
| 2015 |  | 2014 |  | December 31, 2013 |  |  | April 30, 2013
Basic weighted average shares outstanding | 45,173,542 |  |  | 45,093,304 |  |  | 45,003,925 |  |  |  | 302,469,544 |
Effect of potential dilutive shares: |  |  |  |  |  |  |  |
Warrants | 809,834 |  |  | 1,786,804 |  |  | 1,297,620 |  |  |  | — |
Stock options | 5,313 |  |  | 9,807 |  |  | — |  |  |  | — |
Restricted stock units | 14,221 |  |  | 37,812 |  |  | 1,189 |  |  |  | 109,701 |
Performance stock units | 3,117 |  |  | 5,526 |  |  | — |  |  |  | — |
Diluted weighted average shares outstanding | 46,006,027 |  |  | 46,933,253 |  |  | 46,302,734 |  |  |  | 302,579,245 |

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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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