Net Income Per Share (Tables)

9 Months Ended

Sep. 30, 2011

Net Income Per Share [Abstract]

Computation Of Net Income Per Share

	Three months ended				Nine months ended
	September 30, 2011		September 30, 2010		September 30, 2011		September 30, 2010
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	62,460	$	37,967	$	190,907	$	113,758
Shares used in computation:
Weighted-average common shares outstanding		52,569		52,142		52,599		52,510
Basic earnings per share	$	1.19	$	0.73	$	3.63	$	2.17
Diluted earnings per share:
Net income	$	62,460	$	37,967	$	190,907	$	113,758
Shares used in computation:
Weighted-average common shares outstanding		52,569		52,142		52,599		52,510
Employee stock options and employee stock purchase plan shares		1,301		1,789		1,409		1,831
Weighted-average number of shares		53,870		53,931		54,008		54,341
Diluted earnings per share	$	1.16	$	0.70	$	3.53	$	2.09