A summary of the earnings (loss) per share calculation is as follows (in thousands, except per share amounts):



	Three Months Ended					Six Months Ended
	June 30,					June 30,
	2013		2012			2013		2012
Basic earnings per share:
Net income (loss)	$	13,672	$	(7,176	)	$	24,575	$	285
Weighted-average common shares	29,178		28,619			28,967		28,423
Basic earnings (loss) per share	$	0.47	$	(0.25	)	$	0.85	$	0.01
Diluted earnings per share (1):
Net income (loss)	$	13,672	$	(7,176	)	$	24,575	$	285
Weighted-average common shares	29,178		28,619			28,967		28,423
Effect of dilutive securities:
Employee stock plans	980		—			1,010		1,201
Diluted weighted-average common shares	30,158		28,619			29,977		29,624
Diluted earnings (loss) per share	$	0.45	$	(0.25	)	$	0.82	$	0.01

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(1)

The Company includes the shares underlying performance-based awards in the calculation of diluted earnings per share if the performance conditions have been satisfied as of the end of the reporting period and excludes such shares when the necessary conditions have not been met. The Company has excluded the shares underlying the 2013 and 2012 awards in the 2013 and 2012 calculation, respectively, as those shares were not contingently issuable as of the end of the period.