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Derivative Instruments (Details 1) - Energy contracts and options [Member] - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Asset Derivatives not designated or not qualifying as hedging instruments | $ 344 | $ 327
Liability Derivatives not designated or not qualifying as hedging instruments | 1,339 | 1,979
Other current assets [Member] |  |
Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Asset Derivatives not designated or not qualifying as hedging instruments | 335 | 324
Other assets [Member] |  |
Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Asset Derivatives not designated or not qualifying as hedging instruments | 9 | 3
Other current liabilities [Member] |  |
Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Liability Derivatives not designated or not qualifying as hedging instruments | 1,297 | 1,909
Other liabilities [Member] |  |
Schedule of fair value of outstanding derivative instruments recorded as assets and liability |  |
Liability Derivatives not designated or not qualifying as hedging instruments | $ 42 | $ 70

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