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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)