Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 384,557	$ 217,922
Short-term investments	192,234	273,591
Restricted cash	2,017	577
Accounts receivable, net	63,169	95,038
Inventories	59,807	113,434
Prepaid expenses and other current assets	32,155	40,756
Assets of discontinued segment held for sale		2,341
Deferred income taxes	10,545	10,885
Total current assets	744,484	754,544
Property, plant and equipment at cost, net	98,302	86,067
Goodwill	55,828	55,828
Deferred income taxes	935
Intangible assets, net	20,974	25,882
Other assets	16,781	13,742
Total assets	937,304	936,063
Current liabilities:
Accounts payable	26,087	40,398
Accrued expenses and other current liabilities	74,260	106,626
Deferred revenue	9,380	11,305
Income taxes payable	2,292	3,532
Liabilities of discontinued segment held for sale		5,359
Current portion of long-term debt	268	248
Total current liabilities	112,287	167,468
Deferred income taxes	7,137	5,029
Long-term debt	2,138	2,406
Other liabilities	4,530	640
Total liabilities	126,092	175,543
Equity:
Preferred stock, 500,000 shares authorized; no shares issued and outstanding
Common stock; $.01 par value; authorized 120,000,000 shares; 39,328,503 and 39,328,503 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	708,723	688,353
Retained earnings	96,123	265,317
Accumulated other comprehensive income	5,973	6,590
Less: treasury stock, at cost; 5,278,828 shares in 2011		(200,175)
Total equity	811,212	760,520
Total liabilities and equity	$ 937,304	$ 936,063