Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVES. (Details 1)

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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]        
Realized Gains (Losses) $ (3,783) $ (499) $ (4,413) $ (2,157)
Unrealized Gains (Losses) $ 8,754 $ (2,410) $ 9,298 $ (1,213)