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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative asset, gross amounts recognized		$ 353
Derivative liability, gross amount recognized	$ 221,838	137,664
Derivative asset, gross amounts offset		0
Derivative liability, gross amounts offset	(8,692)	(2,097)
Derivative asset, net asset		353
Derivative liability, net liability	213,146	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		9
Derivative asset, gross amounts offset		0
Derivative asset, net asset		9
Commodity derivative instruments [Member] | Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	184,832	117,629
Derivative liability, gross amounts offset	(4,703)	(1,913)
Derivative liability, net liability	180,129	115,716
Commodity derivative instruments [Member] | Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, gross amount recognized	37,006	20,035
Derivative liability, gross amounts offset	(3,989)	(184)
Derivative liability, net liability	$ 33,017	$ 19,851

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