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DERIVATIVES. (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Realized Gains (Losses) |  |  | $ 1,565 | $ (4,362) |  |  |
Unrealized Gains (Losses) |  |  |  |  | $ (3,235) | $ 2,088 | $ (3,370)
Non Designated Derivative Instruments [Member] | Commodity Contracts [Member] | Cost of goods sold [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Realized Gains (Losses) | $ 2,262 | $ 916 | (2,150) | (1,241) | (3,479) | (4,165) | 1,386
Unrealized Gains (Losses) | $ (5,582) | $ (1,907) | $ 3,715 | $ (3,121) | $ (3,235) | $ 2,088 | $ (3,370)

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