CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 85,637	$ 60,708
Short-term marketable securities	87,560	114,575
Accounts receivable, net of allowances of $186 and $191 in 2015 and 2014, respectively (Note 2)	12,631	10,186
Inventories	65,009	64,025
Deferred tax assets	39	39
Prepaid expenses and other current assets	11,458	16,379
Total current assets	262,334	265,912
PROPERTY AND EQUIPMENT, net	94,179	95,823
INTANGIBLE ASSETS, net	42,758	35,524
GOODWILL	91,849	80,599
DEFERRED TAX ASSETS	11,265	11,562
OTHER ASSETS	4,789	4,243
Total assets	507,174	493,663
CURRENT LIABILITIES:
Accounts payable	23,907	21,980
Accrued payroll and related expenses	8,815	9,071
Taxes payable	2,930	2,963
Deferred tax liabilities	2,187	2,193
Deferred income on sales to distributors	17,254	15,223
Other accrued liabilities	3,834	3,730
Total current liabilities	58,927	55,160
LONG-TERM INCOME TAXES PAYABLE	746	743
DEFERRED TAX LIABILITIES	4,059	4,272
OTHER LIABILITIES	2,960	2,812
Total liabilities	66,692	62,987
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS’ EQUITY:
Common stock	29	29
Additional paid-in capital	178,816	171,938
Accumulated other comprehensive loss	(1,031)	(1,136)
Retained earnings	262,668	259,845
Total stockholders’ equity	440,482	430,676
Total liabilities and stockholders’ equity	$ 507,174	$ 493,663