Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 226,022,000	$ 146,900,000
Investment securities	70,869,000	79,259,000
Cash, cash equivalents and investment securities	296,891,000	226,159,000
Accounts receivable, net of allowance for doubtful accounts of $1,208 at December 31, 2013 and $998 at December 31, 2012	45,318,000	49,127,000
Inventories	34,451,000	36,333,000
Prepaid income taxes	5,966,000	2,320,000
Prepaid expenses and other current assets	7,319,000	7,271,000
Deferred income taxes	4,351,000	4,293,000
Total current assets	394,296,000	325,503,000
PROPERTY AND EQUIPMENT, net	87,861,000	85,937,000
GOODWILL	1,478,000	1,478,000
INTANGIBLE ASSETS, net	8,490,000	9,952,000
DEFERRED INCOME TAXES	7,518,000	5,642,000
TOTAL ASSETS	499,643,000	428,512,000
CURRENT LIABILITIES:
Accounts payable	11,335,000	11,308,000
Accrued liabilities	15,551,000	17,810,000
Total current liabilities	26,886,000	29,118,000
DEFERRED INCOME TAXES	3,630,000	5,247,000
INCOME TAX LIABILITY	4,402,000	3,290,000
COMMITMENTS AND CONTINGENCIES	0	0
STOCKHOLDERS' EQUITY:
Convertible preferred stock, $1.00 par value Authorized-500 shares; Issued and outstanding - none	0	0
Common stock, $0.10 par value - Authorized-80,000 shares; Issued 15,103 shares at December 31, 2013 and 14,855 shares at December 31, 2012, outstanding 15,102 shares at December 31, 2013 and 14,458 shares at December 31, 2012	1,510,000	1,486,000
Additional paid-in capital	78,495,000	63,770,000
Treasury stock, at cost - 1 shares at December 31, 2013 and 397 shares at December 31, 2012	(49,000)	(15,128,000)
Retained earnings	382,576,000	342,158,000
Accumulated other comprehensive loss	2,193,000	(1,429,000)
Total stockholders' equity	464,725,000	390,857,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	499,643,000	428,512,000
Allowance for doubtful accounts	1,208,000	998,000
Convertible preferred stock, par value	$ 1	$ 1
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	$ 0.1	$ 0.1
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	15,103,000	14,855,000
Common stock, shares outstanding	15,102,000	14,488,000
Treasury Stock, shares	1,000	397,000