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Consolidated Statement of Stockholders' Equity (Parenthetical) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income tax benefit | $ 18,000 | $ 17,000 | $ 51,000 | $ 50,000
Purchase of treasury stock |  |  | $ 96,000 |
Treasury Stock |  |  |  |
Restricted stock vested (in shares) | (3,363) | (4,574) | (7,237) | (4,574)
Purchase of treasury stock | $ (49,000) | $ (20,000) | $ (96,000) | $ (20,000)
Foreign currency hedging derivatives: |  |  |  |
Tax benefit, hedge | 0 | (88,000) | 0 | 98,000
Interest rate swaps: |  |  |  |
Tax benefit, hedge | $ 0 | $ (39,000) | $ 0 | $ 125,000

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