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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amounts recognized | $ 9,238 | $ 118,980
Derivative liability, gross amount recognized | 38,474 | 104
Derivative asset, gross amounts offset | (4,590) | (12,105)
Derivative liability, gross amounts offset | (9,540) | 0
Derivative asset, net asset | 4,648 | 106,875
Derivative liability, net liability | 28,934 | 104
Commodity derivative instruments | Current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amounts recognized | 6,734 | 110,729
Derivative asset, gross amounts offset | (2,267) | (10,799)
Derivative asset, net asset | 4,467 | 99,930
Commodity derivative instruments | Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amounts recognized | 2,504 | 8,251
Derivative asset, gross amounts offset | (2,323) | (1,306)
Derivative asset, net asset | 181 | 6,945
Commodity derivative instruments | Current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 36,599 | 84
Derivative liability, gross amounts offset | (8,936) | 0
Derivative liability, net liability | 27,663 | 84
Commodity derivative instruments | Noncurrent liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 1,875 | 20
Derivative liability, gross amounts offset | (604) | 0
Derivative liability, net liability | $ 1,271 | $ 20

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