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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Net operating losses | $ 9,540 | $ 5,992
Environmental and closure reserves | 2,124 | 2,158
Depreciation and amortization |  | 907
Other | 1,263 | 1,252
Depreciation and amortization | (2,418) |
Goodwill and indefinite lived intangible assets | (586) | (1,694)
Prepaid expenses | (30) | (50)
Deferred tax assets liabilities gross | 9,893 | 8,565
Valuation allowance | (10,479) | (10,259)
Net deferred income tax liabilities | $ (586) | $ (1,694)

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