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Comprehensive Income - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Amortization of defined benefit pension items |  |  |  |  |  |
Prior service cost | [1] | $ 5 |  | $ 2 | $ 15 | $ 5
Actuarial losses | [1] | 119 |  | 217 | 357 | 652
Total before tax |  | 124 |  | 219 | 372 | 657
Tax benefit |  | (32) | [1] | (57) | (97) | (171)
Net of tax |  | $ 92 |  | $ 162 | $ 275 | $ 486
[1] | These amounts were included in pension expense. See Note 7 for additional details.

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