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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2018
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:
Year Ended December 31, | 2018 |  | 2017 |  | 2016
Basic weighted average shares outstanding | 45,665,883 |  |  | 45,367,932 |  |  | 45,212,414 |
Effect of potential dilutive shares(1): |  |  |  |  |
Warrants | 441,104 |  |  | — |  |  | 312,619 |
Stock options | — |  |  | — |  |  | 447 |
Restricted stock units | 77,572 |  |  | — |  |  | 116,105 |
Performance stock units (2) | 375,276 |  |  | — |  |  | 81,939 |
Diluted weighted average shares outstanding | 46,559,835 |  |  | 45,367,932 |  |  | 45,723,524 |
Anti-dilutive shares excluded from the above reconciliation |  |  |  |  |
Stock options | 16,667 |  |  | 126,667 |  |  | 110,000 |
Warrants | — |  |  | 4,053,670 |  |  | — |
Restricted stock units | — |  |  | 68,654 |  |  | — |
Performance stock units (2) | — |  |  | 322,943 |  |  | — |
(1) | For the year ended December 31, 2017, Ambac has a net loss and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was anti-dilutive.
(2) | Performance stock units that are dilutive are reflected based on the performance metrics through the balance sheet date. Performance stock units that are anti-dilutive are reflected at their target issuance amounts. Vesting of these units is contingent upon meeting certain performance metrics. Although a portion of these performance metrics have been achieved as of the respective period end, it is possible that awards may no longer meet the metric at the end of the performance period.

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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://fasb.org/us-gaap/role/ref/legacyRef -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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