Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2017

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,
	2017	2016
Basic weighted average shares outstanding	45,292,253	45,176,978
Effect of potential dilutive shares (1):
Restricted stock units	—	56,902
Performance stock units	—	10,117
Diluted weighted average shares outstanding	45,292,253	45,243,997
Anti-dilutive shares excluded from the above reconciliation:
Stock options	126.667	176,668
Warrants	4,053,670	4,407,537
Restricted stock units	94.204	51,992
Performance stock units (2)	342.456	263,988

(1) For the three months ended March 31, 2017, Ambac incurred net losses and accordingly excluded all potentially dilutive securities from the determination of diluted loss per share as their impact was antidilutive.

(2) Performance stock units are reflected herein at their target issuance amounts. Vesting of these units are 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.