Net Income (Loss) Per Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

Net Income (Loss) Per Share

Basic net income (loss) per share is computed using the weighted-average number of outstanding shares of common stock during the period. Diluted net income (loss) per share is computed using the weighted-average number of outstanding shares of common stock and, when dilutive, potential outstanding shares of common stock during the period. Potential common shares consist of shares issuable upon the assumed conversion of the Company’s Senior Convertible Notes and incremental shares issuable upon the assumed exercise of stock options. The computation of net income (loss) per share is as follows:

	Three Months Ended
	March 31, 2012			March 31, 2011
	(in thousands, except per share data)
Basic earnings per share:
Net income (loss)	$	(4,584	)	$	60,233
Shares used in computation:
Weighted-average common shares outstanding	55,456			52,759
Basic earnings per share	$	(0.08	)	$	1.14
Diluted earnings per share:
Net income (loss)	$	(4,584	)	$	60,233
Shares used in computation:
Weighted-average common shares outstanding	55,456			52,759
Employee stock options	—			1,487
Weighted-average number of shares	55,456			54,246
Diluted earnings per share	$	(0.08	)	$	1.11

For the three months ended March 31, 2012, 2.3 million shares issuable upon the assumed conversion of the Company's Senior Convertible Notes and 1.8 million incremental shares issuable upon the assumed exercise of stock options are not included in the calculation of diluted earnings per share, as their inclusion would have been anti-dilutive.

For the three months ended March 31, 2011, employee stock options with exercise prices greater than the average market price of the common stock during the period were excluded from the diluted calculation of earnings per share, as their inclusion would have been anti-dilutive. The number of options excluded for the three months ended March 31, 2011 was 26,864.