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Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Gross profit | $ 371,072 | $ 397,701 | $ 349,749 |
Research and development expense | 25,800 | 26,900 | 29,800 |
Provision for credit losses from uncollected receivables and contract assets | 1,628 | 309 | 579 |
Total equity | $ (819,865) | (702,689) | (608,280) | $ (573,015)
Receivable with imputed interest, effective yield (interest rate) | 2.00% |  |  |
Noncurrent receivables invoice terms (in years) | 10 years |  |  |
Assets for plan benefits, defined benefit plan | $ 31,100 | 21,300 |  |
Software | Minimum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Useful life | 5 years |  |  |
Software | Maximum |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Useful life | 8 years |  |  |
Albany Safran Composites, LLC |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent | 90.00% |  |  |
Entity In Russia |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Noncontrolling interest, ownership percentage by parent | 50.00% |  |  |
Retained earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total equity | $ (770,746) | (698,496) | (589,645) | (534,082)
Share-based Payment Arrangement, Option |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Expiration period | 20 years |  |  |
Length of time options are valid after retirement, in years | 10 years |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Provision for credit losses from uncollected receivables and contract assets |  | 1,800 |  |
Total equity |  | 1,443 | (35) | 5,395
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total equity |  | 1,443 | (35) | $ 5,068
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings, Pre-Tax |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Total equity |  | 300 | 300 |
Long term contract |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Gross profit | $ 9,900 | 10,800 | $ (2,000) |
Assets |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Assets for plan benefits, defined benefit plan | $ 700 | $ 800 |  |

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