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Acquisitions (Details Textual) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 12, 2010
Business Acquisition [Line Items] |  |  |  |
Total revenues | $ 1,584,788,000 | $ 1,612,498,000 | $ 1,465,984,000 |
Operating income | 101,874,000 | 85,272,000 | 64,589,000 |
Acquisition (Textual) [Abstract] |  |  |  |
Payment made for acquisition |  |  |  | 231,100,000
Advanced Airlaid Materials [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total revenues | 246,300,000 | 252,000,000 | 193,500,000 |
Operating income | $ 18,000,000 | $ 13,400,000 | $ 4,400,000 |

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- Definition Amount of cash paid to acquire the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph f(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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