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Derivatives (Net Asset or Liability Positions in Balance Sheet) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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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) | $ 109,346 | $ 14,944 | $ (52,888)
Net derivative asset position, Fair value of derivatives | (5,996) | 22,285 | 68,244
Net derivative asset position, net | 103,350 | 37,229 | 15,356
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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