The following table is a reconciliation of the weighted average shares used in the computation of income (loss) per share for the periods presented (in thousands, except per share data):

	Three Months Ended September 30,
	2018						2017
			Weighted							Weighted
	Income		Average		Per-		Income			Average		Per-
	(Loss)		Shares		Share		(Loss)			Shares		Share
Income (loss) per share — basic
Net income (loss) available to common stockholders	$	15,682		23,106	$	0.68	$	(17,614	)		22,772	$	(0.77	)
Effect of dilutive securities:
Convertible senior notes		1,487		21,426				—			—
Unvested performance stock grants		—		832				—			—
Unvested restricted stock grants		—		322				—			—
Income (loss) per share — diluted
Net income (loss) available to common stockholders plus assumed exercises and conversion	$	17,169		45,686	$	0.38	$	(17,614	)		22,772	$	(0.77	)

	Nine Months Ended September 30,
	2018								2017
				Weighted								Weighted
	Income			Average		Per-			Income			Average		Per-
	(Loss)			Shares		Share			(Loss)			Shares		Share
Income (loss) per share — basic
Net income (loss) available to common stockholders	$	(39,121	)		23,104	$	(1.69	)	$	(52,672	)		20,848	$	(2.53	)
Effect of dilutive securities:
Convertible senior notes		—			—					—			—
Unvested performance stock grants		—			—					—			—
Unvested restricted stock grants		—			—					—			—
Income (loss) per share — diluted
Net income (loss) available to common stockholders plus assumed exercises and conversion	$	(39,121	)		23,104	$	(1.69	)	$	(52,672	)		20,848	$	(2.53	)