Consolidated Balance Sheets - USD ($)	Dec. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 445,082,000	$ 336,164,000
Short-term investment securities	0	41,233,000
Cash, cash equivalents and investment securities	445,082,000	377,397,000
Accounts receivable, net of allowance for doubtful accounts of $1,073 at December 31, 2016 and $1,101 at December 31, 2015	56,161,000	57,847,000
Inventories	49,264,000	43,632,000
Prepaid income taxes	11,235,000	14,366,000
Prepaid expenses and other current assets	7,355,000	7,631,000
Assets Held-for-sale	0	4,134,000
Total current assets	569,097,000	505,007,000
PROPERTY AND EQUIPMENT, net	85,696,000	74,320,000
GOODWILL	5,577,000	6,463,000
INTANGIBLE ASSETS, net	22,383,000	23,936,000
DEFERRED INCOME TAXES	21,935,000	17,099,000
TOTAL ASSETS	704,688,000	626,825,000
CURRENT LIABILITIES:
Accounts payable	14,641,000	13,670,000
Accrued liabilities	25,896,000	28,948,000
Total current liabilities	40,537,000	42,618,000
LONG-TERM LIABILITIES	1,107,000	1,476,000
DEFERRED INCOME TAXES	1,370,000	1,372,000
INCOME TAX LIABILITY	1,519,000	1,488,000
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 and outstanding, 16,338 shares at December 31, 2016 and 16,086 shares at December 31, 2015	1,633,000	1,608,000
Additional paid-in capital	162,828,000	145,125,000
Treasury Stock, Value	(14,000)	0
Retained earnings	516,980,000	453,896,000
Accumulated other comprehensive loss	(21,272,000)	(20,758,000)
Total stockholders' equity	660,155,000	579,871,000
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	704,688,000	626,825,000
Allowance for doubtful accounts	$ 1,073,000	$ 1,101,000
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	16,337,763	16,086,000
Common stock, shares outstanding	16,337,670	16,086,000
Treasury Stock, Common, Shares	93	0

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.