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Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues and other items:    
Sales $ 217,198 $ 191,524
Other income (expense), net 2,565 194
Revenues, total 219,763 191,718
Costs and expenses:    
Cost of goods sold 176,057 157,858
Freight 5,336 3,999
Selling, general and administrative 19,447 16,162
Research and development 3,646 3,557
Amortization of intangibles 1,412 129
Interest expense 1,007 355
Asset impairments and costs associated with exit and disposal activities 893  
Total 207,798 182,060
Income from continuing operations before income taxes 11,965 9,658
Income taxes 4,167 2,990
Income from continuing operations 7,798 6,668
Income (loss) from discontinued operations (4,800)  
Net income $ 2,998 $ 6,668
Earnings (loss) per share:    
Continuing operations $ 0.24 $ 0.21
Discontinued operations $ (0.15)  
Net income $ 0.09 $ 0.21
Diluted    
Continuing operations $ 0.24 $ 0.21
Discontinued operations $ (0.15)  
Net income $ 0.09 $ 0.21
Shares used to compute earnings per share:    
Basic 32,010 31,854
Diluted 32,393 32,262
Dividends per share $ 0.045 $ 0.045