Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 387,048	$ 217,922
Short-term investments	185,692	273,591
Restricted cash	852	577
Accounts receivable, net	60,320	95,038
Inventories	74,360	113,434
Prepaid expenses and other current assets	40,964	40,756
Assets of discontinued segment held for sale		2,341
Deferred income taxes	8,974	10,885
Total current assets	758,210	754,544
Property, plant and equipment at cost, net	99,058	86,067
Goodwill	55,828	55,828
Intangible assets, net	22,006	25,882
Other assets	19,453	13,742
Total assets	954,555	936,063
Current liabilities:
Accounts payable	35,429	40,398
Accrued expenses and other current liabilities	87,318	106,626
Deferred revenue	5,716	11,305
Income taxes payable	1,096	3,532
Liabilities of discontinued segment held for sale		5,359
Current portion of long-term debt	263	248
Total current liabilities	129,822	167,468
Deferred income taxes	5,023	5,029
Long-term debt	2,207	2,406
Other liabilities	303	640
Total liabilities	137,355	175,543
Equity:
Preferred stock, 500,000 shares authorized; no shares issued and outstanding
Common stock; $.01 par value; authorized 120,000,000 shares; 39,334,469 shares issued and outstanding in 2012; and 44,047,264 and 38,768,436 shares issued and outstanding in 2011	393	435
Additional paid-in-capital	705,134	688,353
Retained earnings	105,178	265,317
Accumulated other comprehensive income	6,495	6,590
Less: treasury stock, at cost; 5,278,828 shares in 2011		(200,175)
Total equity	817,200	760,520
Total liabilities and equity	$ 954,555	$ 936,063