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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Change in post-retirement benefits, tax | $ 34,000 | $ 25,000
Foreign currency hedging derivatives: |  |
Income tax benefit | (105,000) | 105,000
Interest rate swaps: |  |
Income tax benefit | $ 57,000 | $ (64,000)

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