CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 147,155	$ 139,836
Short-term marketable securities	66,855	40,899
Accounts receivable, net of allowances of $216 and $215 in 2012 and 2011, respectively (Note 2)	16,696	9,396
Inventories	42,851	52,010
Deferred tax assets	890	892
Prepaid expenses and other current assets	6,222	7,068
Total current assets	280,669	250,101
LONG-TERM MARKETABLE SECURITIES	0	32,041
PROPERTY AND EQUIPMENT, net	89,695	88,241
INTANGIBLE ASSETS, net	8,663	8,852
GOODWILL	14,786	14,786
DEFERRED TAX ASSETS	12,716	12,387
OTHER ASSETS	43,724	26,511
Total assets	450,253	432,919
CURRENT LIABILITIES:
Accounts payable	15,165	16,532
Accrued payroll and related expenses	5,279	5,911
Deferred income on sales to distributors	9,373	7,883
Other accrued liabilities	2,661	2,305
Total current liabilities	32,478	32,631
LONG-TERM INCOME TAXES PAYABLE	35,190	34,368
Total liabilities	67,668	66,999
COMMITMENTS AND CONTINGENCIES (Note 9, 11 and 12)
STOCKHOLDERS’ EQUITY:
Common stock	28	28
Additional paid-in capital	168,918	158,646
Accumulated other comprehensive income	398	50
Retained earnings	213,241	207,196
Total stockholders’ equity	382,585	365,920
Total liabilities and stockholders’ equity	$ 450,253	$ 432,919