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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - Commodity derivative instruments - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 200	$ 3,928
Derivative liability, gross amount recognized		34,498
Derivative asset, gross amounts offset	0	(2,754)
Derivative liability, gross amounts offset		(14,683)
Derivative asset, net asset	200	1,174
Derivative liability, net liability		19,815
Current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	200	633
Derivative asset, gross amounts offset	0	(98)
Derivative asset, net asset	$ 200	535
Noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized		3,295
Derivative asset, gross amounts offset		(2,656)
Derivative asset, net asset		639
Current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized		33,812
Derivative liability, gross amounts offset		(14,117)
Derivative liability, net liability		19,695
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized		686
Derivative liability, gross amounts offset		(566)
Derivative liability, net liability		$ 120

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