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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Net sales $ 455,721 $ 405,189
Energy and related sales, net 5,262 1,101
Total revenues 460,983 406,290
Costs of products sold 405,943 348,915
Gross profit 55,040 57,375
Selling, general and administrative expenses 33,551 33,487
Gains on dispositions of plant, equipment and timberlands, net (809) (73)
Operating income 22,298 23,961
Non-operating income (expense)    
Interest expense (4,812) (3,841)
Interest income 61 102
Other, net 211 247
Total non-operating expense (4,540) (3,492)
Income before income taxes 17,758 20,469
Income tax provision 3,110 4,840
Net income $ 14,648 $ 15,629
Earnings per share    
Basic $ 0.34 $ 0.36
Diluted $ 0.33 $ 0.36
Cash dividends declared per common share $ 0.11 $ 0.10
Weighted average shares outstanding    
Basic 43,366 42,966
Diluted 44,360 43,921