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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Contingent consideration | Derivative instruments — non-current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 39,717
Derivative asset, gross amounts offset	0
Derivative asset, net asset	39,717
Commodity contracts
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	435,691	$ 97,688
Derivative liability, gross amounts offset	(26,838)	(3,130)
Derivative liability, net liability	408,853	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	271,077	59,262
Derivative liability, gross amounts offset	(4,740)	(2,318)
Derivative liability, net liability	266,337	56,944
Commodity contracts | Derivative instruments — non-current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	164,614	38,426
Derivative liability, gross amounts offset	(22,098)	(812)
Derivative liability, net liability	$ 142,516	$ 37,614

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- Definition

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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