Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
CURRENT ASSETS:
Cash and cash equivalents	$ 7,970	$ 22,953
Marketable securities	27,707	36,404
Accounts receivable, net	62,754	84,322
Inventories:
Finished goods	36,119	36,078
Work in process	50,084	49,690
Raw materials	9,396	6,746
Supplies	15
Total inventory	95,614	92,514
Deferred tax assets	8,083	8,083
Income tax receivable	1,504	213
Other current assets	19,609	19,584
Total current assets	223,241	264,073
Property, Plant and equipment, gross	164,193	155,872
Less allowance for depreciation	68,574	66,283
PROPERTY, PLANT AND EQUIPMENT, NET	95,619	89,589
GOODWILL	11,485	11,485
INTANGIBLE ASSETS, net	22,254	24,698
NOTE RECEIVABLE	3,725	3,695
Total assets	356,324	393,540
CURRENT LIABILITIES:
Accounts payable	31,573	38,323
Accrued liabilities	15,266	15,907
Total current liabilities	46,839	54,230
DEFERRED INCOME TAX	6,761	6,759
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Common stock, $1 par value: Authorized: 12,000,000 Issued: 7,440,518	7,441	7,441
Paid-in capital	5,287	4,998
Retained earnings	306,631	336,895
Accumulated other comprehensive income	12	8
Stockholders' Equity before Treasury Stock	319,371	349,342
Treasury stock, at cost	16,647	16,791
Total stockholders' equity	302,724	332,551
Total liabilities and stockholders' equity	$ 356,324	$ 393,540