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Comprehensive Income (Loss) - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Amortization of defined benefit pension items |  |
Prior service cost | $ (63) | $ (63)
Actuarial losses | 826 | 689
Total before tax | 763 | 626
Tax benefit | (198) | (163)
Net of tax | $ 565 | $ 463

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