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Derivatives (Net Asset or Liability Positions in Balance Sheet) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
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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) | $ 22,855 | $ 56,005 | $ 21,751
Net derivative asset position, Fair value of derivatives | 20,977 | (10,323) | 38,580
Net derivative asset position, net | 43,832 | 45,682 | 60,331
Net derivative liability position, Collateral paid | 0 | 0 | 0
Net derivative liability position, Fair value of derivatives | 0 | 0 | 0
Net derivative liability position, net | $ 0 | $ 0 | $ 0

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