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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 9,238	$ 118,980
Derivative liability, gross amount recognized	38,474	104
Derivative asset, gross amounts offset	(4,590)	(12,105)
Derivative liability, gross amounts offset	(9,540)	0
Derivative asset, net asset	4,648	106,875
Derivative liability, net liability	28,934	104
Commodity derivative instruments | Current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	6,734	110,729
Derivative asset, gross amounts offset	(2,267)	(10,799)
Derivative asset, net asset	4,467	99,930
Commodity derivative instruments | Noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	2,504	8,251
Derivative asset, gross amounts offset	(2,323)	(1,306)
Derivative asset, net asset	181	6,945
Commodity derivative instruments | Current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	36,599	84
Derivative liability, gross amounts offset	(8,936)	0
Derivative liability, net liability	27,663	84
Commodity derivative instruments | Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	1,875	20
Derivative liability, gross amounts offset	(604)	0
Derivative liability, net liability	$ 1,271	$ 20

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