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Derivative Instruments - Location and Fair Value of Commodity Derivatives (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting Derivative Assets [Abstract]
Derivative assets, gross amounts of recognized assets	$ 118,980	$ 353
Derivative assets, gross amounts offset in the balance sheet	(12,105)	0
Derivative assets	106,875	353
Offsetting Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of recognized liabilities	104	137,664
Derivative liabilities, gross amounts offset in the balance sheet	0	(2,097)
Derivative liabilities	104	135,567
Current assets | Commodity derivative instruments
Offsetting Derivative Assets [Abstract]
Derivative assets, gross amounts of recognized assets	110,729	344
Derivative assets, gross amounts offset in the balance sheet	(10,799)	0
Derivative assets	99,930	344
Non-current assets | Commodity derivative instruments
Offsetting Derivative Assets [Abstract]
Derivative assets, gross amounts of recognized assets	8,251	9
Derivative assets, gross amounts offset in the balance sheet	(1,306)	0
Derivative assets	6,945	9
Current liabilities | Commodity derivative instruments
Offsetting Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of recognized liabilities	84	117,629
Derivative liabilities, gross amounts offset in the balance sheet	0	(1,913)
Derivative liabilities	84	115,716
Non-current liabilities | Commodity derivative instruments
Offsetting Derivative Liabilities [Abstract]
Derivative liabilities, gross amounts of recognized liabilities	20	20,035
Derivative liabilities, gross amounts offset in the balance sheet	0	(184)
Derivative liabilities	$ 20	$ 19,851

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