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Derivatives (Net Asset or Liability Positions in Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Estimated fair value of Company's commodity derivative instruments for cash collateral and associated cash as collateral |  |  |
Net derivative asset position, Collateral paid (received) | $ 95,533 | $ 208,670 | $ 22,855
Net derivative liability position, Fair value of derivatives | (76,388) | (157,301) |
Net derivative asset position, Fair value of derivatives |  |  | 20,977
Net derivative asset position, net | $ 19,145 | $ 51,369 | $ 43,832

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