Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 36,610	$ 11,222
Marketable securities	129,439	144,252
Accounts receivable, net	43,266	65,220
Inventories:
Finished goods	26,536	27,242
Work in process	65,569	72,219
Raw materials	5,543	4,978
Total inventory	97,648	104,439
Income tax receivable	607
Assets held for sale	528	6,189
Other current assets	6,852	7,186
Total current assets	314,950	338,508
PROPERTY, PLANT AND EQUIPMENT:
PROPERTY, PLANT AND EQUIPMENT	108,795	103,538
Less allowance for depreciation	60,395	58,370
PROPERTY, PLANT AND EQUIPMENT, NET	48,400	45,168
GOODWILL	11,485	11,485
INTANGIBLE ASSETS, net	1,170	3,330
NOTES RECEIVABLE	6,858	6,750
DEFERRED INCOME TAXES	977	995
OTHER ASSETS	5,696	5,637
Total assets	389,536	411,873
CURRENT LIABILITIES:
Accounts payable	29,535	28,445
Federal and state income taxes		3,750
Accrued liabilities	12,654	13,092
Liabilities held for sale		210
Total current liabilities	42,189	45,497
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 shares; Issued: 7,440,518 shares	7,441	7,441
Paid-in capital	9,889	9,074
Retained earnings	344,529	364,757
Accumulated other comprehensive loss	(21)	(86)
Stockholders' equity before treasury stock	361,838	381,186
Treasury stock, at cost	14,491	14,810
Total stockholders' equity	347,347	366,376
Total liabilities and stockholders' equity	$ 389,536	$ 411,873

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
Period Type:	instant

- 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.