Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 235,951,000	$ 226,022,000
Investment securities	79,896,000	70,869,000	[1]
Cash, cash equivalents and investment securities	315,847,000	296,891,000	[1]
Accounts receivable, net of allowance for doubtful accounts of $1,201 at June 30, 2014 and $1,208 at December 31, 2013	41,022,000	45,318,000	[1]
Inventories	37,819,000	34,451,000	[1]
Prepaid income taxes	6,651,000	5,966,000	[1]
Prepaid expenses and other current assets	6,729,000	7,319,000	[1]
Deferred income taxes	4,577,000	4,351,000	[1]
Total current assets	412,645,000	394,296,000	[1]
PROPERTY AND EQUIPMENT, net	91,899,000	87,861,000	[1]
GOODWILL	1,478,000	1,478,000	[1]
INTANGIBLE ASSETS, net	7,668,000	8,490,000	[1]
DEFERRED INCOME TAXES	5,827,000	7,518,000	[1]
TOTAL ASSETS	519,517,000	499,643,000	[1]
CURRENT LIABILITIES:
Accounts payable	11,328,000	11,335,000	[1]
Accrued liabilities	15,798,000	15,551,000	[1]
Total current liabilities	27,126,000	26,886,000	[1]
DEFERRED INCOME TAXES	4,211,000	3,630,000	[1]
INCOME TAX LIABILITY	2,713,000	4,402,000	[1]
COMMITMENTS AND CONTINGENCIES
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 15,287 shares at June 30, 2014 and 15,103 shares at December 31, 2013, outstanding 15,268 shares at June 30, 2014 and 15,102 shares at December 31, 2013	1,529,000	1,510,000	[1]
Additional paid-in capital	88,625,000	78,495,000	[1]
Treasury stock, at cost - 19 shares at June 30, 2014 and 1 shares at December 31, 2013	(1,188,000)	(49,000)	[1]
Retained earnings	395,111,000	382,576,000	[1]
Accumulated other comprehensive income	1,390,000	2,193,000	[1]
Total stockholders' equity	485,467,000	464,725,000	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	519,517,000	499,643,000	[1]
Allowance for doubtful accounts	1,201,000	1,208,000
Convertible preferred stock, par value	$ 1.00	$ 1.00
Convertible preferred stock, authorized shares	500,000	500,000
Convertible preferred stock, issued shares	$ 0	$ 0
Convertible preferred stock, outstanding shares	0	0
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	15,287,000	15,103,000
Common stock, shares outstanding	15,268,000	15,102,000
Treasury Stock, shares	19,000	1,000

[1] December 31, 2013 balances were derived from audited consolidated financial statements.