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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
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:
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Basic weighted average shares outstanding |  | 45,986,043 |  |  | 45,683,058 |  |  | 45,909,595 |  |  | 45,577,656 |
Effect of potential dilutive shares (1): |  |  |  |  |  |  |  |
Stock options |  | — |  |  | — |  |  | — |  |  | — |
Warrants |  | — |  |  | 392,772 |  |  | — |  |  | 196,386 |
Restricted stock units |  | — |  |  | 70,498 |  |  | — |  |  | 54,720 |
Performance stock units (2) |  | — |  |  | 326,047 |  |  | — |  |  | 268,885 |
Diluted weighted average shares outstanding |  | 45,986,043 |  |  | 46,472,375 |  |  | 45,909,595 |  |  | 46,097,647 |
Anti-dilutive shares excluded from the above reconciliation: |  |  |  |  |  |  |  |
Stock options |  | 16,667 |  |  | 126,667 |  |  | 16,667 |  |  | 126,667 |
Warrants |  | 4,877,783 |  |  | — |  |  | 4,877,783 |  |  | — |
Restricted stock units |  | 263,151 |  |  | — |  |  | 244,202 |  |  | 5,362 |
Performance stock units (2) |  | 699,038 |  |  | — |  |  | 651,310 |  |  | — |
(1) | For the three and six months ended June 30, 2019, Ambac had 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 are reflected based on the performance metrics through the balance sheet date. 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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