Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net product sales	$ 294,136	$ 204,047	$ 813,588	$ 555,872
Cost of sales:
Cost of sales	33,186	23,369	93,067	64,342
Gain on intellectual property settlement	(53,377)	0	(53,377)	0
Total cost of sales	(20,191)	23,369	39,690	64,342
Operating expenses:
Research and development	54,280	36,567	159,323	103,023
Selling, general and administrative	89,957	77,572	272,054	221,609
Acquisition-related costs	967	236	19,447	11,164
Impairment of acquired in-process research and development	26,300	0	26,300	0
Amortization of purchased intangible assets	104	104	312	278
Total operating expenses	171,608	114,479	477,436	336,074
Operating income	142,719	66,199	296,462	155,456
Other income and expense:
Investment income	317	523	872	1,691
Interest expense	(1,855)	(204)	(6,220)	(605)
Foreign currency loss	(416)	(841)	(817)	(952)
Income before income taxes	140,765	65,677	290,297	155,590
Income tax provision	48,586	107	116,446	28,445
Net income	92,179	65,570	173,851	127,145
Earnings per common share
Basic	$ 0.48	$ 0.36	$ 0.92	$ 0.70
Diluted	$ 0.46	$ 0.34	$ 0.88	$ 0.66
Shares used in computing earnings per common share
Basic	193,353	183,706	189,219	182,805
Diluted	201,142	192,161	197,635	191,267
Comprehensive income	$ 77,982	$ 82,093	$ 172,017	$ 131,181