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Comprehensive Income - Reclassification adjustments out of accumulated other comprehensive loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Amortization of defined benefit pension items |  |  |  |  |  |
Prior service cost | [1] | $ 1 |  | $ (15) | $ 3 | $ (31)
Actuarial losses | [1] | 229 |  | 262 | 435 | 525
Total before tax |  | 230 |  | 247 | 438 | 494
Tax benefit |  | (60) | [1] | (65) | (114) | (129)
Net of tax |  | $ 170 |  | $ 182 | $ 324 | $ 365
[1] | These amounts were included in pension expense. See Note 8 for additional details.

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