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Net Income Per Share | 12 Months Ended
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Dec. 31, 2015
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 canceled upon emergence from bankruptcy on the Effective Date. 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 years ended December 31, 2015, 2014 and 2013, 740, 949, and 6,312, warrants, respectively, were exercised, resulting in an issuance of 236, 949 and 2,524 shares of common stock. On June 30, 2015, the Board of Directors of Ambac authorized the establishment of a warrant repurchase program that permits the repurchase of up to $10,000 of warrants. As of December 31, 2015, Ambac had repurchased 631,600 warrants at a cost of $5,375, leaving 4,407,537 warrants outstanding. Basic net income per share is computed by dividing net income attributable to common shareholders by the weighted-average number of common shares outstanding and vested restricted stock units. Diluted net income per share is computed by dividing net income attributable to common shareholders by the weighted-average number of common shares outstanding plus all potential dilutive common shares outstanding during the period. All potential dilutive common shares outstanding consider common stock deliverable pursuant to warrants issued under the Reorganization Plan and unvested options, restricted stock units and performance stock units granted under employee and director compensation plans. 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 |
Anti-dilutive securities for the year ended December 31, 2015 included stock options to purchase 110,000 shares of common stock where the exercise price was greater than the average market price. Anti-dilutive securities for the the eight months ended December 31, 2013 included stock options to purchase 66,668 shares of common stock.

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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 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: 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 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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