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Pensions and Other Postretirement Benefit Plans (Schedule of Amounts Reclassified by Segment and Financial Statement) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Increase/(decrease) in expense Effect by segment operating expenses [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses | $ 2,525 | $ 2,356
Increase/(decrease) in expense Effect by segment operating expenses [Member] | Machine Clothing [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses | (44) | 24
Increase/(decrease) in expense Effect by segment operating expenses [Member] | Engineered Composites [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses |  |
Increase/(decrease) in expense Effect by segment operating expenses [Member] | Corporate Expenses [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses | (2,481) | (2,380)
Increase/(decrease) in expense Effect by Statement of Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses | (2,525) | (2,356)
Increase/(decrease) in expense Effect by Statement of Income [Member] | Cost of goods sold [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses | (503) | (716)
Increase/(decrease) in expense Effect by Statement of Income [Member] | Selling, general and administrative expenses [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses | (2,022) | (1,754)
Increase/(decrease) in expense Effect by Statement of Income [Member] | Technical and research expenses [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses |  | 2
Increase/(decrease) in expense Effect by Statement of Income [Member] | Restructuring expenses, net [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total operating expenses |  | $ 112

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