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Condensed Consolidated Statements of Income (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Income [Abstract]    
Net sales $ 405,189 $ 397,352
Energy and related sales, net 1,101 1,861
Total revenues 406,290 399,213
Costs of products sold 348,915 338,243
Gross profit 57,375 60,970
Selling, general and administrative expenses 33,487 29,967
Gains on dispositions of plant, equipment and timberlands, net (73) (37)
Operating income 23,961 31,040
Non-operating income (expense)    
Interest expense (3,841) (4,269)
Interest income 102 123
Other, net 247 196
Total non-operating income (expense) (3,492) (3,950)
Income before income taxes 20,469 27,090
Income tax provision 4,840 8,212
Net income $ 15,629 $ 18,878
Earnings per share    
Basic $ 0.36 $ 0.44
Diluted $ 0.36 $ 0.43
Cash dividends declared per common share $ 0.10 $ 0.09
Weighted average shares outstanding    
Basic 42,966 42,751
Diluted 43,921 43,467