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Retirement Plans - Other Postretirement Benefit Plan (Details) - Other Postretirement Benefits Plan - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 0 | $ 0 | $ 0 | $ 0
Interest cost | 48 | 26 | 96 | 52
Amortization of gain | (84) | 0 | (168) | 0
Total (income) expense, net | $ (36) | $ 26 | $ (72) | $ 52

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