Derivative Financial Instruments - Schedule of Location and Fair Value Amounts of All Derivative Instruments (Details) - Derivatives Not Designated as Hedging Contracts - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivative asset - current \| Commodity Contracts
Derivative Asset [Abstract]
Gross Recognized Assets	$ 36,727	$ 13,321
Gross Amounts Offset, Assets	(5,101)	(4,461)
Total financial assets	31,626	8,860
Derivative liability - current \| Commodity Contracts
Derivative Liability [Abstract]
Gross Recognized Liabilities	5,101	11,350
Gross Amounts Offset, Liabilities	(5,101)	(4,461)
Total financial liabilities	0	6,889
Derivative liability - current \| Interest Rate Swap
Derivative Liability [Abstract]
Gross Recognized Liabilities	169	0
Gross Amounts Offset, Liabilities	0	0
Total financial liabilities	169	0
Derivative asset - noncurrent \| Commodity Contracts
Derivative Asset [Abstract]
Gross Recognized Assets	11,642	1,031
Gross Amounts Offset, Assets	0	(261)
Total financial assets	11,642	770
Derivative liability - noncurrent \| Commodity Contracts
Derivative Liability [Abstract]
Gross Recognized Liabilities	0	261
Gross Amounts Offset, Liabilities	0	(261)
Total financial liabilities	0	0
Derivative liability - noncurrent \| Interest Rate Swap
Derivative Liability [Abstract]
Gross Recognized Liabilities	349	0
Gross Amounts Offset, Liabilities	0	0
Total financial liabilities	$ 349	$ 0

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