Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 60,610	$ 74,738
Short-term investments	77,265	34,497
Accounts receivable, less allowances: 2011, $1,294; 2010,$3,925	25,385	34,131
Inventories	36,286	36,709
Income taxes receivable	6,881	6,547
Prepaid expenses and other	2,883	2,718
Deferred income taxes	22,854	25,022
Total current assets	232,164	214,362
LONG-TERM INVESTMENTS	6,857	12,166
PROPERTY, PLANT AND EQUIPMENT, NET	60,884	64,517
INTANGIBLE ASSETS, NET	0	255
DEFERRED INCOME TAXES, NET	8,657	9,740
OTHER ASSETS	1,413	1,413
TOTAL	309,975	302,453
CURRENT LIABILITIES:
Accounts payable	17,096	19,672
Accrued compensation	4,997	8,451
Accrued commissions	1,964	2,067
Other accrued liabilities	2,368	1,455
Deferred income on shipments to distributors	30,671	38,646
Current portion of long-term debt	0	2,857
Total current liabilities	57,096	73,148
LONG-TERM INCOME TAXES PAYABLE	6,450	5,664
Total liabilities	63,546	78,812
COMMITMENTS AND CONTINGENCIES (Notes 9 and 11)
SHAREHOLDERS' EQUITY:
Preferred stock, no par value - authorized: 5,000,000 shares; issued and outstanding: none
Common stock, no par value - authorized: 250,000,000 shares; Issued and outstanding:2011 - 61,038,507; 2010 - 61,604,160	206	2,401
Accumulated other comprehensive loss	(887)	(1,212)
Retained earnings	247,110	222,452
Total shareholders' equity	246,429	223,641
TOTAL	$ 309,975	$ 302,453