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Guarantor Financial Statements (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Consolidating Statements of Income                      
Net sales $ 391,389 $ 404,354 $ 384,693 $ 397,352 $ 391,905 $ 416,493 $ 397,985 $ 396,771 $ 1,577,788 $ 1,603,154 $ 1,455,331
Energy and related sales, net                 7,000 9,344 10,653
Total revenues                 1,584,788 1,612,498 1,465,984
Costs of products sold                 1,371,139 1,406,305 1,279,737
Gross profit 52,609 59,192 40,878 60,970 53,610 54,916 37,500 60,167 213,649 206,193 186,247
Selling, general and administrative expenses                 121,590 124,871 122,111
Gains on dispositions of plant, equipment and timberlands, net                 (9,815) (3,950) (453)
Operating income                 101,874 85,272 64,589
Other non-operating income (expense)                      
Interest expense                 (18,694) (31,794) (25,547)
Interest income                 460 666 808
Other, net                 (4,699) (3,299) (6,321)
Total other non-operating income (expense)                 (22,933) (34,427) (31,060)
Income (loss) before income taxes                 78,941 50,845 33,529
Income tax provision (benefit)                 19,562 8,151 (20,905)
Net income (loss)                 59,379 42,694 54,434
Other comprehensive income                 2,775 (45,494) (1,362)
Comprehensive income (loss)                 62,154 (2,800) 53,072
Parent Company [Member]
                      
Condensed Consolidating Statements of Income                      
Net sales                 894,777 875,077 842,615
Energy and related sales, net                 7,000 9,344 10,653
Total revenues                 901,777 884,421 853,268
Costs of products sold                 794,364 787,216 753,562
Gross profit                 107,413 97,205 99,706
Selling, general and administrative expenses                 71,228 70,632 73,802
Gains on dispositions of plant, equipment and timberlands, net                 (514) (348) (123)
Operating income                 36,699 26,921 26,027
Other non-operating income (expense)                      
Interest expense                 (18,689) (30,741) (24,963)
Interest income                 (2,867) 2,706 (657)
Other, net                 40,332 41,954 24,428
Total other non-operating income (expense)                 18,776 13,919 (535)
Income (loss) before income taxes                 55,475 40,840 25,492
Income tax provision (benefit)                 (3,904) (1,854) (28,942)
Net income (loss)                 59,379 42,694 54,434
Other comprehensive income                 2,775 (45,494) (1,362)
Comprehensive income (loss)                 62,154 (2,800) 53,072
Guarantors [Member]
                      
Condensed Consolidating Statements of Income                      
Net sales                 53,838 50,837 49,919
Total revenues                 53,838 50,837 49,919
Costs of products sold                 49,061 47,330 43,468
Gross profit                 4,777 3,507 6,451
Selling, general and administrative expenses                 2,818 2,681 2,287
Gains on dispositions of plant, equipment and timberlands, net                 (9,276) (3,590) (373)
Operating income                 11,235 4,416 4,537
Other non-operating income (expense)                      
Interest income                 6,831 7,838 7,445
Other, net                 749 467 (1,218)
Total other non-operating income (expense)                 7,580 8,305 6,227
Income (loss) before income taxes                 18,815 12,721 10,764
Income tax provision (benefit)                 6,585 2,161 2,463
Net income (loss)                 12,230 10,560 8,301
Other comprehensive income                 3,243 (3,350) (6,875)
Comprehensive income (loss)                 15,473 7,210 1,426
Non Guarantors [Member]
                      
Condensed Consolidating Statements of Income                      
Net sales                 683,022 728,077 612,716
Total revenues                 683,022 728,077 612,716
Costs of products sold                 581,544 622,841 532,454
Gross profit                 101,478 105,236 80,262
Selling, general and administrative expenses                 47,544 51,558 46,022
Gains on dispositions of plant, equipment and timberlands, net                 (25) (12) 43
Operating income                 53,959 53,690 34,197
Other non-operating income (expense)                      
Interest expense                 (5) (1,053) (1,241)
Interest income                 (3,504) (5,578) (4,665)
Other, net                 1,283 1,447 330
Total other non-operating income (expense)                 (2,226) (5,184) (5,576)
Income (loss) before income taxes                 51,733 48,506 28,621
Income tax provision (benefit)                 16,889 9,369 6,142
Net income (loss)                 34,844 39,137 22,479
Other comprehensive income                 3,920 (5,276) (15,406)
Comprehensive income (loss)                 38,764 33,861 7,073
Adjustments/ Eliminations [Member]
                      
Condensed Consolidating Statements of Income                      
Net sales                 (53,849) (50,837) (49,919)
Total revenues                 (53,849) (50,837) (49,919)
Costs of products sold                 (53,830) (51,082) (49,747)
Gross profit                 (19) 245 (172)
Operating income                 (19) 245 (172)
Other non-operating income (expense)                      
Interest income                   (4,300) (1,315)
Other, net                 (47,063) (47,167) (29,861)
Total other non-operating income (expense)                 (47,063) (51,467) (31,176)
Income (loss) before income taxes                 (47,082) (51,222) (31,348)
Income tax provision (benefit)                 (8) (1,525) (568)
Net income (loss)                 (47,074) (49,697) (30,708)
Other comprehensive income                 (7,163) 8,626 22,281
Comprehensive income (loss)                 $ (54,237) $ (41,071) $ (8,499)