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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	$ 25	$ 353
Derivative liability, gross amount recognized	238,967	137,664
Derivative asset, gross amounts offset	0	0
Derivative liability, gross amounts offset	(9,150)	(2,097)
Derivative asset, net asset	25	353
Derivative liability, net liability	229,817	135,567
Commodity derivative instruments [Member] | Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized		344
Derivative asset, gross amounts offset		0
Derivative asset, net asset		344
Commodity derivative instruments [Member] | Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized	25	9
Derivative asset, gross amounts offset	0	0
Derivative asset, net asset	25	9
Commodity derivative instruments [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	198,306	117,629
Derivative liability, gross amounts offset	(3,496)	(1,913)
Derivative liability, net liability	194,810	115,716
Commodity derivative instruments [Member] | Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	40,661	20,035
Derivative liability, gross amounts offset	(5,654)	(184)
Derivative liability, net liability	$ 35,007	$ 19,851

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