Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 322,963	$ 336,164	[1]
Short-term investment securities	49,475	41,233	[1]
Total cash, cash equivalents and investment securities	372,438	377,397	[1]
Accounts receivable, net of allowance for doubtful accounts of $1,121 at September 30, 2016 and $1,101 at December 31, 2015	53,638	57,847	[1]
Inventories	50,953	43,632	[1]
Prepaid income taxes	15,202	14,366	[1]
Prepaid expenses and other current assets	6,569	7,631	[1]
Assets held-for-sale	4,249	4,134	[1]
Total current assets	503,049	505,007	[1]
PROPERTY AND EQUIPMENT, net	80,588	74,320	[1]
Long-term investment securities	57,162	0
GOODWILL	5,577	6,463	[1]
INTANGIBLE ASSETS, net	22,832	23,936	[1]
DEFERRED INCOME TAXES	19,491	17,099	[1]
TOTAL ASSETS	688,699	626,825	[1]
CURRENT LIABILITIES:
Accounts payable	12,555	13,670	[1]
Accrued liabilities	19,961	28,948	[1]
Total current liabilities	32,516	42,618	[1]
LONG-TERM LIABILITIES	1,197	1,476	[1]
DEFERRED INCOME TAXES	5,022	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 and Outstanding 16,307 shares at September 30, 2016 and 16,086 shares at December 31, 2015	1,631	1,608	[1]
Additional paid-in capital	157,603	145,125	[1]
Retained earnings	507,468	453,896	[1]
Accumulated other comprehensive loss	(18,226)	(20,758)	[1]
Total stockholders' equity	648,476	579,871	[1]
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	688,699	626,825	[1]
Allowance for doubtful accounts	$ 1,121	$ 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	16,307,000	15,595,000
Common stock, shares outstanding	16,307,000	15,595,000
Treasury Stock, Shares	0	0

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