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Segment Information - Reconciliation of Segment Information, Revenue and Other Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue, Major Customer [Line Items]
Gain on Commodity Derivative Instruments	$ 33,414	$ 115,142
Other Operating Income	5,884	4,958
Total Revenue and Other Operating Income	473,073	416,359
Operating Segments
Revenue, Major Customer [Line Items]
Total Segment Revenue from Contracts with External Customers	$ 433,775	$ 296,259

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