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Derivative and Hedging Instruments (Details-3) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Collateral posted against derivative positions | $ (1,500) |
Commodity Derivative Contracts [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts | 1,738 | $ 342
Gross amounts offset in balance sheet | (192) | (342)
Collateral posted against derivative positions | (1,546) | 0
Net amount presented in the balance sheet | 0 | 0
PPA [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts | 25,440 | 32,530
Gross amounts offset in balance sheet | 0 | 0
Collateral posted against derivative positions | 0 | 0
Net amount presented in the balance sheet | $ 25,440 | $ 32,530

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