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Derivatives, Hedging Programs and Other Financial Instruments - Additional Information (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
Collateral posted for net derivatives | $ 0 | $ 0
Cash collateral posted from customers | 500,000 | 200,000
Designated as Hedging Instrument | Purchase |  |
Derivative [Line Items] |  |
Derivative net liability | $ 14,400,000 | $ 7,200,000

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