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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Additional income tax benefit |  |  |  |  | $ 600 |
Percent of eligible investments for Oklahoma tax credit | 1.00% |  | 1.00% |  |  |
Period of eligible investments for Oklahoma tax credit |  |  | 5 years |  |  |
Additional tax credit on certain capital expenditure, percent |  |  |  |  | 1.00% |
Income tax benefit | $ (560) | $ (5,527) | $ (7,924) | $ (9,398) | $ 300 | $ 900
Expected effective income tax rate for the year |  |  | 24.00% |  |  |

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