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DERIVATIVES. (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized Losses | $ (4,568) | $ (3,479)
Unrealized Gains (Losses) | 5,123 | (3,235)
Non Designated Derivative Instruments [Member] | Commodity Contracts [Member] | Cost of goods sold [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Realized Losses | (4,568) | (3,479)
Unrealized Gains (Losses) | $ 5,123 | $ (3,235)

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