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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
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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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