Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Apr. 05, 2015	Dec. 31, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 49,356	$ 54,043
Marketable securities	20,593	22,404
Accounts receivable, net	51,346	68,752
Inventories:
Finished goods	30,686	30,308
Work in process	54,055	50,569
Raw materials and supplies	8,488	8,181
Total inventory	93,229	89,058
Deferred tax assets	6,623	6,623
Income tax receivable		1,668
Other current assets	23,058	14,321
Total current assets	244,205	256,869
PROPERTY, PLANT AND EQUIPMENT:
PROPERTY, PLANT AND EQUIPMENT	172,735	171,264
Less allowance for depreciation and amortization	78,124	75,721
PROPERTY, PLANT AND EQUIPMENT, NET	94,611	95,543
GOODWILL	11,485	11,485
INTANGIBLE ASSETS, net	8,250	10,644
NOTE RECEIVABLE	3,850	3,818
Total assets	362,401	378,359
CURRENT LIABILITIES:
Accounts payable	33,426	32,948
Federal and state income taxes	4,590
Accrued liabilities	13,998	15,680
Total current liabilities	52,014	48,628
DEFERRED INCOME TAXES	4,292	4,288
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	6,195	5,906
Retained earnings	308,412	328,417
Accumulated other comprehensive income (loss)	4	(3)
Stockholders' Equity before Treasury Stock	322,052	341,761
Treasury stock, at cost	15,957	16,318
Total stockholders' equity	306,095	325,443
Total liabilities and stockholders' equity	$ 362,401	$ 378,359