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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Adjustment for pension and postretirement benefit liability, tax | $ 14 | $ 19 | $ 28 | $ 38
Adjustment for interest rate swap, tax | $ 146 | $ (497) | $ 13 | $ 43

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