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Reportable Segments and Geographic Data (Schedule of Operating Assets and Capital Expenditures by Reporting Segment) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | $ 1,156,697 | $ 1,230,928 | $ 1,278,293
Capital expenditures and purchased software | 37,207 | 27,428 | 30,957
Machine Clothing [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 660,595 | 713,142 | 773,135
Capital expenditures and purchased software | 14,717 | 11,141 | 19,234
Engineered Composites [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 109,717 | 80,916 | 74,332
Capital expenditures and purchased software | 18,979 | 9,684 | 6,559
Cash [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 190,718 | 118,909 | 117,925
Income Taxes Receivable and Deferred [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 144,480 | 164,654 | 179,535
Other Assets [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets | 51,187 | 34,670 | 30,771
Assets of Discontinued Operations [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Assets |  | 118,637 | 102,595
Research Expense [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital expenditures and purchased software | 1,493 | 2,052 | 1,084
Unallocated Expenses [Member] |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |
Capital expenditures and purchased software | $ 2,018 | $ 4,551 | $ 4,080

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- Definition Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 28 -Subparagraph b -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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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 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 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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