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Derivative Instruments and Hedging Activities (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018
Derivatives designated as hedging instruments: |  |  |  |  |
Derivative contracts |  |  |  |  |
Assets |  |  | $ 26 | $ 92 | $ 180
Liabilities |  |  | (256) | (1,086) | (862)
Derivatives designated as hedging instruments: | Foreign currency forward contracts |  |  |  |  |
Derivative contracts |  |  |  |  |
Notional Amounts |  |  | 8,294 | 11,050 | 11,050
Assets |  |  |  |  | 177
Liabilities |  |  | (122) | (407) |
Derivatives designated as hedging instruments: | Commodity futures contracts |  |  |  |  |
Derivative contracts |  |  |  |  |
Notional Amounts |  |  | 4,726 | 9,580 | 8,285
Assets |  |  | 26 | 92 | 3
Liabilities |  |  | $ (134) | $ (679) | $ (862)
Forecast | Foreign currency forward contracts |  |  |  |  |
Derivative contracts |  |  |  |  |
Loss to be reclassified | $ (84) | $ (38) |  |  |
Forecast | Commodity futures contracts |  |  |  |  |
Derivative contracts |  |  |  |  |
Gain (loss) to be reclassified | $ (108) |  |  |  |

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