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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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