Derivative Financial Instruments - Schedule of Location and Fair Value Amounts of All Derivative Instruments (Details) - Derivatives Not Designated as Hedging Contracts - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative asset - current \| Commodity Contracts
Derivatives, Fair Value [Line Items]
Gross recognized assets	$ 11,071	$ 13,321
Gross amounts offset, assets	(3,562)	(4,461)
Total financial assets	7,509	8,860
Derivative liability - current \| Commodity Contracts
Derivatives, Fair Value [Line Items]
Gross recognized liabilities	4,492	11,350
Gross amounts offset, liabilities	(3,562)	(4,461)
Total financial liabilities	930	6,889
Derivative liability - current \| Interest Rate Swap
Derivatives, Fair Value [Line Items]
Gross recognized liabilities	205	0
Gross amounts offset, liabilities	0	0
Total financial liabilities	205	0
Derivative asset - noncurrent \| Commodity Contracts
Derivatives, Fair Value [Line Items]
Gross recognized assets	396	1,031
Gross amounts offset, assets	0	(261)
Total financial assets	396	770
Derivative liability - noncurrent \| Commodity Contracts
Derivatives, Fair Value [Line Items]
Gross recognized liabilities	0	261
Gross amounts offset, liabilities	0	(261)
Total financial liabilities	0	0
Derivative liability - noncurrent \| Interest Rate Swap
Derivatives, Fair Value [Line Items]
Gross recognized liabilities	173	0
Gross amounts offset, liabilities	0	0
Total financial liabilities	$ 173	$ 0

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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