Net Income Per Share (Tables)

3 Months Ended

Mar. 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:

	Three Months Ended March 31,
	2018	2017
Basic weighted average shares outstanding	45,471,083	45,292,253
Effect of potential dilutive shares (1):
Warrants	—	—
Restricted stock units	45,713	—
Performance stock units	136,675	—
Diluted weighted average shares outstanding	45,653,471	45,292,253
Anti-dilutive shares excluded from the above reconciliation:
Stock options	126,667	126,667
Warrants	4,053,476	4,053,670
Restricted stock units	—	94,204
Performance stock units (2)	—	342,456

(1) For the three months ended March 31, 2017, 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 herein 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.