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Reportable Segments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 251,373 | $ 223,603 |
Performance obligations | 90,000 | 115,000 |
Remaining performance obligation expected to be recognized during 2019 | 53,000 |  |
Albany Safran Composites, LLC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | 56,000 | 40,800 |
Invoiced receivables, unbilled receivables and contract receivables | 107,800 |  | $ 96,200
Machine Clothing [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net sales | $ 144,334 | $ 141,773 |
Increase decrease in assets |  |  | 5,600
AEC assets [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Increase decrease in assets |  |  | 500
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Increase decrease in assets |  |  | $ 1,000

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