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Segment and Geographic Information (Details 4) (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
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
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
Plant, equipment and timberlands, net | 621,186 |  |  |  | 601,950 |  |  |  | 621,186 | 601,950 | 608,200
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 952,195 | 933,357 | 880,089
Plant, equipment and timberlands, net | 248,185 |  |  |  | 250,217 |  |  |  | 248,185 | 250,217 | 251,318
Germany [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 358,442 | 410,183 | 327,952
Plant, equipment and timberlands, net | 191,559 |  |  |  | 181,537 |  |  |  | 191,559 | 181,537 | 198,585
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 119,092 | 122,218 | 128,598
Plant, equipment and timberlands, net | 59,131 |  |  |  | 57,634 |  |  |  | 59,131 | 57,634 | 55,672
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 106,702 | 88,018 | 75,195
Plant, equipment and timberlands, net | 83,796 |  |  |  | 86,079 |  |  |  | 83,796 | 86,079 | 80,177
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 41,357 | 49,378 | 43,497
Plant, equipment and timberlands, net | $ 38,515 |  |  |  | $ 26,483 |  |  |  | $ 38,515 | $ 26,483 | $ 22,418

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- Definition Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 12 -Paragraph 5 -Subparagraph b, c -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 + Details
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