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Derivative Instruments - Schedule of Location and Fair Value of Outstanding Commodity Derivative Instruments (Details) - Commodity derivative instruments - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amounts recognized | $ 80,006 | $ 118,980
Derivative liability, gross amount recognized | 1,428 | 104
Derivative asset, gross amounts offset | (18,097) | (12,105)
Derivative liability, gross amounts offset | (598) | 0
Derivative asset, net asset | 61,909 | 106,875
Derivative liability, net liability | 830 | 104
Current assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amounts recognized | 63,743 | 110,729
Derivative asset, gross amounts offset | (11,563) | (10,799)
Derivative asset, net asset | 52,180 | 99,930
Noncurrent assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, gross amounts recognized | 16,263 | 8,251
Derivative asset, gross amounts offset | (6,534) | (1,306)
Derivative asset, net asset | 9,729 | 6,945
Current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, gross amount recognized | 1,428 | 84
Derivative liability, gross amounts offset | (598) | 0
Derivative liability, net liability | 830 | 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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