Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 80,538	$ 11,222
Marketable securities	102,516	144,252
Accounts receivable, net	43,771	65,220
Inventories:
Finished goods	32,772	27,242
Work in process	58,818	72,219
Raw materials	6,033	4,978
Total inventory	97,623	104,439
Income tax receivable	2,057
Assets held for sale	528	6,189
Other current assets	6,649	7,186
Total current assets	333,682	338,508
PROPERTY, PLANT AND EQUIPMENT:
PROPERTY, PLANT AND EQUIPMENT	107,119	103,538
Less allowance for depreciation	60,896	58,370
PROPERTY, PLANT AND EQUIPMENT, NET	46,223	45,168
GOODWILL	11,485	11,485
INTANGIBLE ASSETS, net	1,118	3,330
NOTES RECEIVABLE	6,912	6,750
DEFERRED INCOME TAXES	986	995
OTHER ASSETS	3,966	5,637
Total assets	404,372	411,873
CURRENT LIABILITIES:
Accounts payable	36,612	28,445
Federal and state income taxes		3,750
Accrued liabilities	13,801	13,092
Liabilities held for sale		210
Total current liabilities	50,413	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	10,118	9,074
Retained earnings	350,906	364,757
Accumulated other comprehensive loss	(52)	(86)
Stockholders' equity before treasury stock	368,413	381,186
Treasury stock, at cost	14,454	14,810
Total stockholders' equity	353,959	366,376
Total liabilities and stockholders' equity	$ 404,372	$ 411,873