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CONDENSED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Sep. 29, 2012
Dec. 31, 2011
Current Assets    
Cash and cash equivalents $ 75,123 $ 81,056
Short-term investments 29,973   
Trade receivables, net 47,474 42,225
Gross inventories 53,517 49,004
Less LIFO reserve (38,435) (37,476)
Less excess and obsolescence reserve (1,712) (1,311)
Net inventories 13,370 10,217
Deferred income taxes 4,851 5,776
Prepaid expenses and other current assets 1,725 6,968
Total Current Assets 172,516 146,242
Property, plant and equipment 189,137 169,142
Less allowances for depreciation (126,006) (116,195)
Net property, plant and equipment 63,131 52,947
Deferred income taxes 1,222 32
Other assets 10,916 7,289
Total Assets 247,785 206,510
Current Liabilities    
Trade accounts payable and accrued expenses 31,330 28,592
Product liability 1,005 1,305
Employee compensation and benefits 16,591 14,882
Workers' compensation 4,433 4,600
Income taxes payable 848 217
Total Current Liabilities 54,207 49,596
Accrued pension liability 19,142 19,082
Product liability 389 441
Contingent liabilities - Note 11      
Stockholders' Equity    
Common Stock 23,460 23,383
Additional paid-in capital 13,686 10,454
Retained earnings 202,328 168,981
Less: Treasury stock - at cost 2012 - 4,299,434 shares 2011 - 4,299,434 shares (37,884) (37,884)
Accumulated other comprehensive loss (27,543) (27,543)
Total Stockholders' Equity 174,047 137,391
Total Liabilities and Stockholders' Equity 247,785 206,510
Nonvoting Common Stock [Member]
    
Stockholders' Equity    
Common Stock      
Voting Common Stock [Member]
    
Stockholders' Equity    
Common Stock $ 23,460 $ 23,383