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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - Commodity derivative instruments - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 40,433	$ 118,980
Derivative liability, gross amount recognized	11,265	104
Derivative asset, gross amounts offset	(15,708)	(12,105)
Derivative liability, gross amounts offset	(6,820)	0
Derivative asset, net asset	24,725	106,875
Derivative liability, net liability	4,445	104
Current assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	28,196	110,729
Derivative asset, gross amounts offset	(9,107)	(10,799)
Derivative asset, net asset	19,089	99,930
Noncurrent assets
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	12,237	8,251
Derivative asset, gross amounts offset	(6,601)	(1,306)
Derivative asset, net asset	5,636	6,945
Current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	11,265	84
Derivative liability, gross amounts offset	(6,820)	0
Derivative liability, net liability	4,445	84
Noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	0	20
Derivative liability, gross amounts offset	0	0
Derivative liability, net liability	$ 0	$ 20

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