Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 275,332	$ 217,922
Short-term investments	247,826	273,591
Restricted cash	852	577
Accounts receivable, net	90,341	95,038
Inventories	103,276	113,434
Prepaid expenses and other current assets	27,948	40,756
Assets held for sale	2,341	2,341
Deferred income taxes	10,222	10,885
Total current assets	758,138	754,544
Property, plant and equipment at cost, net	91,998	86,067
Goodwill	55,828	55,828
Intangible assets, net	24,668	25,882
Other assets	13,720	13,742
Total assets	944,352	936,063
Current liabilities:
Accounts payable	38,243	40,398
Accrued expenses and other current liabilities	103,219	107,656
Deferred profit	7,612	10,275
Income taxes payable	1,888	3,532
Liabilities of discontinued segment held for sale	5,359	5,359
Current portion of long-term debt	253	248
Total current liabilities	156,574	167,468
Deferred income taxes	5,023	5,029
Long-term debt	2,341	2,406
Other liabilities	436	640
Equity:
Preferred stock, 500,000 shares authorized; no shares issued and outstanding
Common stock; $.01 par value; authorized 120,000,000 shares; 38,787,631 and 38,768,436 shares issued and outstanding in 2012 and 2011, respectively	436	435
Additional paid-in-capital	692,015	688,353
Retained earnings	281,729	265,317
Accumulated other comprehensive income	5,973	6,590
Less: treasury stock, at cost; 5,278,828 shares in 2012 and 2011	(200,175)	(200,175)
Total equity	779,978	760,520
Total liabilities and equity	$ 944,352	$ 936,063