Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 35,632	$ 37,437
Marketable securities	45,056	55,586
Accounts receivable, net	72,426	76,443
Inventories:
Finished goods	46,653	33,851
Work in process	47,361	40,340
Raw materials	9,628	9,173
Total inventory	103,642	83,364
Deferred tax assets	8,906	8,906
Other current assets	12,462	9,018
Total current assets	278,124	270,754
PROPERTY, PLANT AND EQUIPMENT	136,805	123,418
Less allowance for depreciation	65,699	61,553
PROPERTY, PLANT AND EQUIPMENT, NET	71,106	61,865
GOODWILL & OTHER INTANGIBLES	17,389	17,722
NOTE RECEIVABLE	3,633	3,571
Total assets	370,252	353,912
CURRENT LIABILITIES:
Accounts payable	41,404	39,077
Federal and state income taxes	12	1,642
Accrued liabilities	15,379	15,254
Total current liabilities	56,795	55,973
DEFERRED INCOME TAXES	7,357	7,368
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	4,739	4,472
Retained earnings	310,797	295,643
Accumulated other comprehensive income	33	53
Stockholders' Equity before Treasury Stock	323,010	307,609
Treasury stock, at cost	16,910	17,038
Total stockholders' equity	306,100	290,571
Total liabilities and stockholders' equity	$ 370,252	$ 353,912