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Net Income Per Share | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Net Income Per Share | 6. NET INCOME PER SHARE Predecessor Ambac common stock (and related stock options and restricted stock units) was cancelled upon emergence from bankruptcy on the Effective Date. As a result, the earnings per share information for Predecessor Ambac is not meaningful to investors in Successor Ambac’s common stock and warrants. Pursuant to the Reorganization Plan, 45,000,000 shares of new common stock at par value of $0.01 per share and 5,047,138 warrants were issued. Warrants entitle such holders to acquire up to 5,047,138 shares of new common stock at an exercise price of $16.67 per share at any time on or prior to April 30, 2023. For the eight months ended December 31, 2013, 6,312 warrants were exercised, resulting in an issuance of 2,524 shares of common stock. As of December 31, 2013, Successor Ambac had 5,040,826 warrants outstanding. Successor Ambac’s common stock and warrants began trading on NASDAQ under the symbols “AMBC” and “AMBCW,” respectively, on May 1, 2013. 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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