Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 122,103	$ 99,590
Investment securities	61,482	60,395	[1]
Cash, cash equivalents and investment securities	183,585	159,985	[1]
Accounts receivable, net of allowance for doubtful accounts of $1,056 at March 31, 2012 and $1,293 at December 31, 2011	41,728	43,571	[1]
Inventories	37,290	40,423	[1]
Prepaid income taxes	3,677	5,589	[1]
Prepaid expenses and other current assets	5,913	6,759	[1]
Deferred income taxes	3,798	4,081	[1]
Total current assets	275,991	260,408	[1]
PROPERTY AND EQUIPMENT, net	83,183	83,048	[1]
GOODWILL	1,478	1,478	[1]
INTANGIBLE ASSETS, net	11,065	11,419	[1]
DEFERRED INCOME TAXES	4,767	4,759	[1]
TOTAL ASSETS	376,484	361,112	[1]
CURRENT LIABILITIES:
Accounts payable	11,825	13,251	[1]
Accrued liabilities	13,562	16,059	[1]
Total current liabilities	25,387	29,310	[1]
DEFERRED INCOME TAXES	7,127	7,144	[1]
INCOME TAX LIABILITY	4,081	4,081	[1]
STOCKHOLDERS' EQUITY:
Convertible preferred stock, $1.00 par value Authorized-500 shares; Issued and outstanding - none	0	0	[1]
Common stock, $0.10 par value - Authorized-80,000 shares; Issued 14,855 shares at March 31, 2012 and December 31, 2011, outstanding 14,117 shares at March 31, 2012 and 13,871 shares at December 31, 2011	1,486	1,486	[1]
Additional paid-in capital	58,106	56,796	[1]
Treasury stock, at cost - 738 shares at March 31, 2012 and 984 shares at December 31, 2011	(27,034)	(35,348)	[1]
Retained earnings	308,478	300,877	[1]
Accumulated other comprehensive income (loss)	(1,147)	(3,234)	[1]
Total stockholders' equity	339,889	320,577	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 376,484	$ 361,112	[1]

[1] December 31, 2011 balances were derived from audited consolidated financial statements.