Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 142,608	$ 219,447
Short-term investments	223,504	131,215
Accounts receivable, net	157,056	127,214
Inventories, net	131,995	117,765
Prepaid expenses and other current assets	38,082	36,239
Deferred income taxes, net	26,304	18,838
Total current assets	719,549	650,718
Property and equipment, net	190,148	160,410
Goodwill	130,747	70,278
Intangible assets, net	83,866	52,816
Other long-term assets	29,984	25,460
Total assets	1,154,294	959,682
Current liabilities:
Accounts payable	41,111	33,544
Accrued compensation	29,616	27,734
Deferred revenue	90,074	71,650
Accrued expenses and other liabilities	37,612	16,538
Other taxes payable	24,507	16,846
Total current liabilities	222,920	166,312
Deferred income taxes	43,186	29,477
Liability for uncertain tax positions	19,494	14,953
Other long-term liabilities	16,683	4,395
Total liabilities	302,283	215,137
Commitments and contingencies
Stockholders' equity:
Preferred stock: par value $0.01; 5,000,000 shares authorized; none issued and outstanding	0	0
Common stock: par value $0.01; 180,000,000 shares authorized; 120,677,143 and 117,904,975 shares issued and outstanding, respectively	1,207	1,179
Additional paid-in capital	471,830	407,713
Retained earnings	382,474	336,363
Accumulated other comprehensive (loss)	(3,500)	(710)
Total stockholders' equity	852,011	744,545
Total liabilities and stockholders' equity	$ 1,154,294	$ 959,682