CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 83,967	$ 92,928
Short-term marketable securities	133,684	109,179
Accounts receivable, net of allowances of $105 and $120 in 2014 and 2013, respectively (Note 2)	16,421	12,389
Inventories	47,934	42,235
Deferred tax assets	2,059	2,059
Prepaid expenses and other current assets	17,027	18,632
Total current assets	301,092	277,422
PROPERTY AND EQUIPMENT, net	92,142	90,141
INTANGIBLE ASSETS, net	38,478	40,334
GOODWILL	80,599	80,599
DEFERRED TAX ASSETS	5,686	9,449
OTHER ASSETS	3,332	3,476
Total assets	521,329	501,421
CURRENT LIABILITIES:
Accounts payable	23,600	20,772
Accrued payroll and related expenses	8,046	8,900
Taxes payable	1,768	2,266
Deferred tax liabilities	1,325	943
Deferred income on sales to distributors	17,844	15,727
Other accrued liabilities	1,698	1,810
Total current liabilities	54,281	50,418
LONG-TERM INCOME TAXES PAYABLE	2,612	6,885
DEFERRED TAX LIABILITIES	4,991	5,273
OTHER LIABILITIES	2,267	2,159
Total liabilities	64,151	64,735
COMMITMENTS AND CONTINGENCIES (Notes 9, 11 and 12)
STOCKHOLDERS’ EQUITY:
Common stock	30	30
Additional paid-in capital	234,667	223,660
Accumulated other comprehensive loss	(315)	(470)
Retained earnings	222,796	213,466
Total stockholders’ equity	457,178	436,686
Total liabilities and stockholders’ equity	$ 521,329	$ 501,421