Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 311,536	$ 142,608
Short-term investments	52,128	223,504
Accounts receivable, net	182,604	157,056
Inventories, net	155,273	131,995
Prepaid expenses and other current assets	49,668	38,082
Deferred income taxes, net	21,563	26,304
Total current assets	772,772	719,549
Property and equipment, net	223,144	190,148
Goodwill	129,092	130,747
Intangible assets, net	75,745	83,866
Other long-term assets	33,491	29,984
Total assets	1,234,244	1,154,294
Current liabilities:
Accounts payable	52,211	41,111
Accrued compensation	34,850	29,616
Deferred revenue- current	87,803	80,059
Accrued expenses and other liabilities	24,785	37,612
Other taxes payable	25,728	24,507
Total current liabilities	225,377	212,905
Deferred income taxes	42,030	43,186
Liability for uncertain tax positions	20,473	19,494
Deferred revenue- long term	20,885	10,015
Other long-term liabilities	7,193	16,683
Total liabilities	315,958	302,283
Commitments and contingencies
Stockholders' equity:
Preferred stock: par value $0.01; 5,000,000 shares authorized; none issued and outstanding
Common stock: par value $0.01; 180,000,000 shares authorized; 122,509,216 and 120,677,143 shares issued and outstanding, respectively	1,225	1,207
Additional paid-in capital	515,973	471,830
Retained earnings	400,694	382,474
Accumulated other comprehensive income (loss)	394	(3,500)
Total stockholders' equity	918,286	852,011
Total liabilities and stockholders' equity	$ 1,234,244	$ 1,154,294