Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 34,455	$ 23,787
Restricted cash	1,096	1,116
Short-term investments	65,950	64,806
Accounts receivable, less allowances: 2014, $979; 2013, $760	34,692	29,437
Inventories	42,051	43,201
Prepaid taxes	0	4,513
Prepaid expenses and other	1,983	2,698
Deferred income taxes	24,133	21,662
Total current assets	204,360	191,220
LONG-TERM INVESTMENTS	1,732	4,195
PROPERTY, PLANT AND EQUIPMENT, NET	56,254	57,779
LONG-TERM PREPAID TAXES	1,711	0
GOODWILL	8,655	8,554
INTANGIBLE ASSETS, NET	10,533	11,749
DEFERRED INCOME TAXES	2,436	1,581
OTHER ASSETS	1,543	1,046
TOTAL ASSETS	287,224	276,124
CURRENT LIABILITIES:
Accounts payable	16,021	13,502
Accrued liabilities	11,956	12,874
Income taxes payable	1,378	0
Deferred income on shipments to distributors	33,023	27,026
Total current liabilities	62,378	53,402
LONG-TERM INCOME TAXES PAYABLE	3,771	3,575
LONG-TERM DEFERRED INCOME TAXES	983	973
OTHER LONG-TERM LIABILITIES	185	201
Total liabilities	67,317	58,151
COMMITMENTS AND CONTINGENCIES (Note 12)
SHAREHOLDERS' EQUITY:
Preferred stock, no par value - authorized: 5,000,000 shares; issued and outstanding: none	0	0
Common stock, no par value - authorized: 250,000,000 shares; issued and outstanding: 2014 - 56,533,444 shares; 2013 - 56,441,346 shares	1,464	0
Accumulated other comprehensive loss	(30)	(320)
Retained earnings	218,473	218,293
Total shareholders' equity	219,907	217,973
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 287,224	$ 276,124