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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - Commodity contracts - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized		$ 467
Derivative liability, gross amount recognized	$ 257,904	97,688
Derivative asset, gross amounts offset		0
Derivative liability, gross amounts offset	(4,894)	(3,130)
Derivative asset, net asset		467
Derivative liability, net liability	253,010	94,558
Derivative instruments — current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized		467
Derivative asset, gross amounts offset		0
Derivative asset, net asset		467
Derivative instruments — non-current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized		0
Derivative asset, gross amounts offset		0
Derivative asset, net asset		0
Derivative instruments — current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	159,043	59,262
Derivative liability, gross amounts offset	(2,593)	(2,318)
Derivative liability, net liability	156,450	56,944
Derivative instruments — non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	98,861	38,426
Derivative liability, gross amounts offset	(2,301)	(812)
Derivative liability, net liability	$ 96,560	$ 37,614

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