Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 271,402	$ 142,608
Short-term investments	79,325	223,504
Accounts receivable, net	188,258	157,056
Inventories, net	148,989	131,995
Prepaid expenses and other current assets	56,089	38,082
Deferred income taxes, net	19,588	26,304
Total current assets	763,651	719,549
Property and equipment, net	205,754	190,148
Goodwill	128,963	130,747
Intangible assets, net	80,679	83,866
Other long-term assets	34,584	29,984
Total assets	1,213,631	1,154,294
Current liabilities:
Accounts payable	51,707	41,111
Accrued compensation	33,354	29,616
Deferred revenue- current	89,497	80,059
Accrued expenses and other liabilities	22,007	37,612
Other taxes payable	22,165	24,507
Total current liabilities	218,730	212,905
Deferred income taxes	43,128	43,186
Liability for uncertain tax positions	21,289	19,494
Deferred revenue- long term	18,488	10,015
Other long-term liabilities	15,668	16,683
Total liabilities	317,303	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; 122,188,083 and 120,677,143 shares issued and outstanding, respectively	1,222	1,207
Additional paid-in capital	501,885	471,830
Retained earnings	393,502	382,474
Accumulated other comprehensive income (loss)	(281)	(3,500)
Total stockholders' equity	896,328	852,011
Total liabilities and stockholders' equity	$ 1,213,631	$ 1,154,294