Net Income (Loss) Per Share

12 Months Ended

Dec. 31, 2011

Net Income (Loss) Per Share [Abstract]

Net Income (Loss) Per Share

Note 5.    Net Income (Loss) Per Share

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. For purposes of computing basic net income (loss) per share, the weighted average number of outstanding shares of common stock excludes unvested restricted stock awards.

For the years ended December 31, 2011 and 2010 diluted net income per share was computed by dividing net income by the weighted average number of common and potential common shares outstanding during the respective periods. Potential common shares represent the number of additional common shares that would have been outstanding if the dilutive potential shares had been issued. For purposes of computing diluted net income per share, weighted average potential common shares do not include potential common shares that are either anti-dilutive under the treasury stock method or restricted shares subject to performance conditions that have not been met. For this reason, potential common shares of 4.0 million and 13.3 million pertaining to outstanding stock options and restricted stock awards were excluded from the computation for the years ended December 31, 2011 and 2010, respectively. None of the 17.7 million shares underlying our Senior Convertible Notes were included in our dilution calculation as our average stock price was less than the conversion price of $39.50.

For the year ended December 31, 2009, diluted net loss per share excludes all potential common shares because the effect of including such shares would be anti-dilutive. Accordingly, the denominator used in computing both basic and diluted net loss per share was the same. The number of potential common shares that could dilute basic net income per share was 20.1 million for the year ended December 31, 2009.

The following table provides a reconciliation of the numerators and denominators of the basic and diluted per share computations:

	Years Ended December 31,
	2011		2010		2009
	(In thousands, except per share amounts)
Numerator:
Net income (loss)	$	250,679	$	262,332	$	(85,235	)
Denominator:
Basic weighted-average shares outstanding		76,161		92,690		96,487
Dilutive common equivalent shares		2,118		1,394		0
Diluted weighted-average shares outstanding		78,279		94,084		96,487
Net income (loss) per share — Basic	$	3.29	$	2.83	$	(0.88	)
Net income (loss) per share — Diluted	$	3.20	$	2.79	$	(0.88	)