Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) for the period by the weighted-average number of shares outstanding during the period, less shares repurchased. In periods of net loss, all potential common shares are anti-dilutive, so diluted net loss per share equals the basic net loss per share. In periods of net income, diluted net income per share is computed by dividing net income for the period by the basic weighted-average number of shares plus any dilutive potential common stock outstanding during the period. Potential common stock includes the effect of outstanding dilutive stock options, restricted stock awards, and restricted stock units computed using the treasury stock method. Any anti-dilutive weighted-average dilutive shares related to stock award plans are excluded from the computation of the diluted net income per share.

The basic and diluted net income (loss) per share calculation for the three and nine months ended September 30, 2018 and 2017 was as follows:



	Three months ended September 30,				Nine months ended September 30,
	2018		2017		2018		2017
	(In thousands, except per share data)
Net income (loss)	$	13,628	$	7,748	$	22,936	$	(707	)
Weighted-average shares outstanding — basic	39,432		37,698		39,015		37,266
Effect of dilutive securities from stock award plans	1,428		1,275		1,222		—
Weighted-average shares outstanding — diluted	$	40,860	$	38,973	40,237		37,266
Net income (loss) per share - basic	$	0.35	$	0.21	$	0.59	$	(0.02	)
Net income (loss) per share - diluted	$	0.33	$	0.20	$	0.57	$	(0.02	)

Anti-dilutive weighted-average shares related to stock award plans	673		1,383		1,176		3,757