Consolidated Balance Sheets - USD ($)	Dec. 31, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 336,164,000	$ 275,812,000
Investment securities	41,233,000	70,952,000
Cash, cash equivalents and investment securities	377,397,000	346,764,000
Accounts receivable, net of allowance for doubtful accounts of $1,101 at December 31, 2015 and $1,127 at December 31, 2014	57,847,000	39,051,000
Inventories	43,632,000	36,933,000
Prepaid income taxes	14,366,000	3,963,000
Prepaid expenses and other current assets	7,631,000	5,818,000
Assets Held-for-sale, Not Part of Disposal Group, Current	4,134,000	0
Total current assets	505,007,000	432,529,000
PROPERTY AND EQUIPMENT, net	74,320,000	86,091,000
GOODWILL	6,463,000	1,478,000
INTANGIBLE ASSETS, net	23,936,000	7,063,000
DEFERRED INCOME TAXES	17,099,000	13,941,000
TOTAL ASSETS	626,825,000	541,102,000
CURRENT LIABILITIES:
Accounts payable	13,670,000	11,378,000
Accrued liabilities	28,948,000	17,350,000
Total current liabilities	42,618,000	28,728,000
DEFERRED INCOME TAXES	1,372,000	1,376,000
INCOME TAX LIABILITY	1,488,000	2,746,000
COMMITMENTS AND CONTINGENCIES	0	0
LONG-TERM LIABILITIES	1,476,000	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 and outstanding, 16,086 shares at December 31, 2015 and 15,595 shares at December 31, 2014	1,608,000	1,559,000
Additional paid-in capital	145,125,000	107,336,000
Retained earnings	453,896,000	408,911,000
Accumulated other comprehensive loss	(20,758,000)	(9,554,000)
Total stockholders' equity	579,871,000	508,252,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	626,825,000	541,102,000
Allowance for doubtful accounts	$ 1,101,000	$ 1,127,000
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	16,086,000	15,595,000
Common stock, shares outstanding	16,086,000	15,595,000