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Derivative Instruments - Location and Fair Value of Commodity Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Derivative Assets [Abstract]
Derivative assets, gross amounts of recognized assets	$ 3,928	$ 118,980
Derivative assets, gross amounts offset in the balance sheet	(2,754)	(12,105)
Derivative assets	1,174	106,875
Offsetting Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of recognized liabilities	34,498	104
Derivative liabilities, gross amounts offset in the balance sheet	(14,683)	0
Derivative liabilities	19,815	104
Current assets | Commodity derivative instruments
Offsetting Derivative Assets [Abstract]
Derivative assets, gross amounts of recognized assets	633	110,729
Derivative assets, gross amounts offset in the balance sheet	(98)	(10,799)
Derivative assets	535	99,930
Non-current assets | Commodity derivative instruments
Offsetting Derivative Assets [Abstract]
Derivative assets, gross amounts of recognized assets	3,295	8,251
Derivative assets, gross amounts offset in the balance sheet	(2,656)	(1,306)
Derivative assets	639	6,945
Current liabilities | Commodity derivative instruments
Offsetting Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of recognized liabilities	33,812	84
Derivative liabilities, gross amounts offset in the balance sheet	(14,117)	0
Derivative liabilities	19,695	84
Non-current liabilities | Commodity derivative instruments
Offsetting Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of recognized liabilities	686	20
Derivative liabilities, gross amounts offset in the balance sheet	(566)	0
Derivative liabilities	$ 120	$ 20

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