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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Amortization of defined benefit pension items |  |  |  |
Prior service cost |  |  | $ (47) |
Actuarial losses |  |  | 788 |
Total before tax |  |  | 741 |
Tax benefit |  |  | (193) |
Net of tax | $ 183 | $ 142 | $ 548 | $ 424

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