Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Document Period End Date	Jun. 30, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 372,895	$ 336,164	[1]
Investment securities	27,720	41,233	[1]
Total cash, cash equivalents and investment securities	400,615	377,397	[1]
Accounts receivable, net of allowance for doubtful accounts of $1,114 at June 30, 2016 and $1,101 at December 31, 2015	60,487	57,847	[1]
Inventories	49,919	43,632	[1]
Prepaid income taxes	12,072	14,366	[1]
Prepaid expenses and other current assets	8,092	7,631	[1]
Assets held-for-sale	4,209	4,134	[1]
Total current assets	535,394	505,007	[1]
PROPERTY AND EQUIPMENT, net	79,704	74,320	[1]
GOODWILL	6,245	6,463	[1]
INTANGIBLE ASSETS, net	23,183	23,936	[1]
DEFERRED INCOME TAXES	18,853	17,099	[1]
TOTAL ASSETS	663,379	626,825	[1]
CURRENT LIABILITIES:
Accounts payable	18,853	13,670	[1]
Accrued liabilities	21,759	28,948	[1]
Total current liabilities	40,612	42,618	[1]
LONG-TERM LIABILITIES	1,288	1,476	[1]
DEFERRED INCOME TAXES	3,764	1,372	[1]
INCOME TAX LIABILITY	1,488	1,488	[1]
COMMITMENTS AND CONTINGENCIES	0	0
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 16,175 shares at June 30, 2016 and 16,086 shares at December 31, 2015; Outstanding 16,125 shares at June 30, 2016 and 16,086 shares at December 31, 2015	1,618	1,608	[1]
Additional paid-in capital	149,344	145,125	[1]
Treasury Stock, at cost - 50 shares at June 30, 2016 and 0 shares at December 31, 2015	(4,471)	0	[1]
Retained earnings	488,662	453,896	[1]
Accumulated other comprehensive loss	(18,926)	(20,758)	[1]
Total stockholders' equity	616,227	579,871	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	663,379	626,825	[1]
Allowance for doubtful accounts	$ 1,114	$ 1,101
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	16,175,000	15,595,000
Common stock, shares outstanding	16,125,000	15,595,000
Treasury Stock, Shares	50,000	0

[1] December 31, 2015 balances were derived from audited consolidated financial statements.