Organization And Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Organization And Summary Of Significant Accounting Policies [Abstract]

Computation Of Net Income Per Share

	Year ended December 31,
	2011		2010		2009
	(in thousands, except per share data)
Basic earnings per share:
Net income	$	226,126	$	160,853	$	115,860
Shares used in computation:
Weighted-average common shares outstanding		52,847		52,529		56,560
Basic earnings per share	$	4.28	$	3.06	$	2.05
Diluted earnings per share:
Net income	$	226,126	$	160,853	$	115,860
Convertible Notes interest expense, net of tax		17		—		—
Numerator for diluted earnings per share		226,143		160,853		115,860
Shares used in computation:
Weighted-average common shares outstanding		52,847		52,529		56,560
Convertible Notes shares		217		—		—
Employee stock options and employee stock purchase plan shares		1,305		1,775		1,856
Weighted-average number of shares		54,369		54,304		58,416
Diluted earnings per share	$	4.16	$	2.96	$	1.98

Summary Of Potential Common Shares Excluded From Diluted Calculation

	Year ended December 31,
	2011		2010		2009
	(in thousands)
Employee stock options		225		14		64