Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 03, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 29,876	$ 56,222
Marketable securities	36,318	32,259
Accounts receivable, net	55,823	67,528
Inventories:
Finished goods	34,064	32,585
Work in process	65,104	57,484
Raw materials and supplies	8,768	8,553
Total inventory	107,936	98,622
Other current assets	7,566	6,961
Total current assets	237,519	261,592
PROPERTY, PLANT AND EQUIPMENT:
PROPERTY, PLANT AND EQUIPMENT	178,124	177,628
Less allowance for depreciation	88,602	86,322
PROPERTY, PLANT AND EQUIPMENT, NET	89,522	91,306
GOODWILL	11,485	11,485
INTANGIBLE ASSETS, net	4,903	5,471
NOTE RECEIVABLE	3,972	3,940
DEFERRED INCOME TAXES	3,333	3,336
OTHER ASSETS	9,832	10,254
Total assets	360,566	387,384
CURRENT LIABILITIES:
Accounts payable	31,464	32,536
Federal and state income taxes	3,314	2,196
Accrued liabilities	13,737	13,398
Total current liabilities	$ 48,515	$ 48,130
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	7,239	6,775
Retained earnings	312,849	340,799
Accumulated other comprehensive loss	(4)	(9)
Stockholders' Equity before Treasury Stock	327,525	355,006
Treasury stock, at cost	15,474	15,752
Total stockholders' equity	312,051	339,254
Total liabilities and stockholders' equity	$ 360,566	$ 387,384