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DERIVATIVES. (Details 1) - Non Designated Derivative Instruments [Member] - Commodity Contracts [Member] - Cost of goods sold [Member] - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized Gains (Losses) | $ (630) | $ (1,658)
Unrealized Gains (Losses) | $ 544 | $ 1,196

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