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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Contingent consideration | Derivative instruments — non-current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 32,860
Derivative asset, gross amounts offset	0
Derivative asset, net asset	32,860
Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	409,603	$ 97,688
Derivative liability, gross amounts offset	(27,954)	(3,130)
Derivative liability, net liability	381,649	94,558
Commodity contracts | 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
Commodity contracts | Derivative instruments — current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	260,314	59,262
Derivative liability, gross amounts offset	(4,259)	(2,318)
Derivative liability, net liability	256,055	56,944
Commodity contracts | Derivative instruments — non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	149,289	38,426
Derivative liability, gross amounts offset	(23,695)	(812)
Derivative liability, net liability	$ 125,594	$ 37,614

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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