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Guarantor Financial Statements (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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)

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- Definition Net of tax amount of other comprehensive income (loss) attributable to both parent entity and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669619-108580 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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- Definition Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Paragraph 5A -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 4 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6386349&loc=d3e3636-108311 + Details
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