Note 9. Earnings (Loss) Per Share

Basic earnings (loss) per share includes no dilution and is computed by dividing net income or loss applicable to common stock by the weighted-average number of common shares outstanding for the respective period. Diluted earnings per share includes the impact of dilutive securities such as unvested shares of restricted stock and performance share units. The following tables present the computations of basic and diluted earnings (loss) per share for the periods indicated:

	Three Months Ended September 30,					Nine Months Ended September 30,
(Shares in thousands)	2018			2017		2018			2017
Basic weighted-average common shares outstanding		29,382			26,377		28,601			24,793
Performance share units and unvested restricted stock		—			479		—			350
Diluted weighted-average common shares outstanding		29,382			26,856		28,601			25,143
Net (loss) income (attributable) available to common stock	$	(5,652	)	$	22,785	$	(65,929	)	$	10,076
Basic (loss) earnings per common share	$	(0.19	)	$	0.86	$	(2.31	)	$	0.41
Diluted (loss) earnings per common share	$	(0.19	)	$	0.85	$	(2.31	)	$	0.40

The diluted loss per share for the three and nine months ended September 30, 2018 did not include the antidilutive effect of 335,491 and 273,979 shares of unvested shares of restricted stock and performance share units, respectively.