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CONDENSED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Current Assets    
Cash and cash equivalents $ 75,960 $ 81,056 [1]
Short-term investments 19,994    [1]
Trade receivables, net 47,332 42,225 [1]
Gross inventories 47,796 49,004 [1]
Less LIFO reserve (37,384) (37,476) [1]
Less excess and obsolescence reserve (1,202) (1,311) [1]
Net inventories 9,210 10,217 [1]
Deferred income taxes 6,753 5,776 [1]
Prepaid expenses and other current assets 859 6,968 [1]
Total Current Assets 160,108 146,242 [1]
Property, plant and equipment 181,161 169,142 [1]
Less allowances for depreciation (122,629) (116,195) [1]
Net property, plant and equipment 58,532 52,947 [1]
Deferred income taxes 405 32 [1]
Other assets 11,364 7,289 [1]
Total Assets 230,409 206,510 [1]
Current Liabilities    
Trade accounts payable and accrued expenses 26,946 28,592 [1]
Product liability 1,010 1,305 [1]
Employee compensation and benefits 14,212 14,882 [1]
Workers' compensation 4,846 4,600 [1]
Income taxes payable 1,194 217 [1]
Total Current Liabilities 48,208 49,596 [1]
Accrued pension liability 19,122 19,082 [1]
Product liability accrual 370 441 [1]
Contingent liabilities - Note 11       [1]
Stockholders' Equity    
Additional paid-in capital 12,473 10,454 [1]
Retained earnings 192,203 168,981 [1]
Less: Treasury stock - at cost 2012 - 4,299,434 shares 2011 - 4,299,434 shares (37,884) (37,884) [1]
Accumulated other comprehensive loss (27,543) (27,543) [1]
Total Stockholders' Equity 162,709 137,391 [1]
Total Liabilities and Stockholders' Equity 230,409 206,510 [1]
Nonvoting Common Stock
    
Stockholders' Equity    
Common Stock, Value       [1]
Voting Common Stock
    
Stockholders' Equity    
Common Stock, Value $ 23,460 $ 23,383 [1]
[1] Note: The balance sheet at December 31, 2011 has been derived from the audited financial statements at that date but does not include all the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements.