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Consolidated Statement of Stockholders Equity (Parenthetical) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax benefit (expense), Post retirement benefits | $ (27,000) | $ (313,000) | $ (123,000)
Income tax benefit (expense), hedging activities | (62,000) | (140,000) |
Foreign currency hedging derivatives |  |  |
Income tax benefit (expense), hedging activities | 98,000 | (286,000) | 87,000
Interest Rate Swaps |  |  |
Income tax benefit (expense), hedging activities | $ (160,000) | $ 146,000 | $ 15,000

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