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Consolidated Statement of Stockholders' Equity (Unaudited) - Parenthetical - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income tax benefit (expense), Post retirement benefits | $ 17,000 | $ 20,000 | $ 50,000 | $ 60,000
Foreign currency hedging derivatives [Member] |  |  |  |
Income tax benefit (expense) | (88,000) | 58,000 | 98,000 | (144,000)
Interest Rate Swaps [Member] |  |  |  |
Income tax benefit (expense) | $ (39,000) | $ 20,000 | $ 125,000 | $ 184,000

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