Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 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 June 30,		Six Months Ended June 30,
	2017	2016	2017	2016
Basic weighted average shares outstanding	45,369,213	45,212,484	45,330,946	45,194,731
Effect of potential dilutive shares (1):
Warrants	250,289	—	—	—
Stock options	—	—	—	—
Restricted stock units	27,609	104,457	—	80,680
Performance stock units	126,398	58,147	—	34,132
Diluted weighted average shares outstanding	45,773,509	45,375,088	45,330,946	45,309,543
Anti-dilutive shares excluded from the above reconciliation:
Stock options	126,667	176,668	126,667	176,668
Warrants	—	4,178,901	—	4,178,901
Restricted stock units	—	23,334	68,654	23,334
Performance stock units (2)	151,527	—	342,092	—

(1) For the six months ended June 30, 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.