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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

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