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Comprehensive Income - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Amortization of defined benefit pension items |  |  |  |
Prior service cost | [1] | $ 5 |  | $ 2
Actuarial losses | [1] | 129 |  | 206
Total before tax |  | 134 |  | 208
Tax benefit |  | (35) | [1] | (54)
Net of tax |  | $ 99 |  | $ 154
[1] | These amounts were included in pension expense. See Note 7 for additional details.

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