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Reportable Segments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | $ 253,253 | $ 222,141 |  | $ 739,459 | $ 636,989 |
Cost of goods sold | 160,227 | 142,582 |  | 472,604 | 418,224 |
Write-off inventory costs |  |  | $ 4,000 |  |  |
Reserve for future losses |  |  | 11,800 |  |  |
AEC contracts [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Cost of goods sold |  |  | $ 15,800 |  |  |
Salt Lake City, Utah [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Non-cash increase of lease modification | $ 12,700 |  |  |  |  |
Lease expiration date | Dec. 31, 2029 |  |  |  |  |
Albany Safran Composites, LLC [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales |  |  |  | 136,900 | 84,100 |
Invoiced receivables, unbilled receivables and contract receivables | $ 99,000 |  |  | 99,000 |  | $ 58,600
Machine Clothing [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Net sales | $ 158,971 | $ 150,694 |  | $ 469,758 | $ 440,093 |
Increase decrease in assets |  |  |  |  |  | 22,000
AEC assets [Member] |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Increase decrease in assets |  |  |  |  |  | $ (13,000)

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