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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Adjustment for pension and postretirement benefit liability, tax | $ 19 | $ 14
Adjustment for interest rate swap, tax | 540 | 1,503
Adjustment for interest rate swap, tax | $ (540) | $ (1,503)

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