CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 175,839	$ 306,386
Marketable securities, short-term	147,740	28,485
Accounts receivable, net of allowances for doubtful accounts, credit reserves and returns of $1,724 and $3,167, respectively	109,179	98,992
Inventories	14,662	15,122
Prepaid expenses and other current assets	34,839	36,808
Total current assets	482,259	485,793
Marketable securities, long-term	76,836	21,252
Property, plant and equipment, net	76,552	79,191
Goodwill	61,745	99,236
Intangible assets, net	24,362	45,777
Deferred tax assets	28,822	21,609
Other assets	8,630	3,454
Total assets	759,206	756,312
Current liabilities:
Accounts payable	19,157	19,549
Accrued liabilities	73,714	74,247
Deferred revenues	70,397	61,975
Total current liabilities	163,268	155,771
Other long-term liabilities	20,254	19,224
Total liabilities	183,522	174,995
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, $0.0001 par value (5,000 shares authorized; none issued)	0	0
Common stock, $0.0001 par value (200,000 shares authorized; 80,114 and 80,611 issued and outstanding at 2013 and 2012, respectively)	8	8
Additional paid-in capital	713,676	670,732
Accumulated other comprehensive income (loss), net	332	203
Accumulated deficit	(138,332)	(89,626)
Total stockholders' equity	575,684	581,317
Total liabilities and stockholders' equity	$ 759,206	$ 756,312