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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Net operating losses | $ 8,662 | $ 9,391
Environmental and closure reserves | 1,839 | 1,977
Lease liability | 642 | 742
Other | 1,734 | 1,295
Depreciation and amortization | (3,447) | (3,211)
Goodwill and indefinite lived intangible assets | (471) | (590)
Right-of-use lease asset | (627) | (730)
481(a) adjustment | (209) | (336)
Prepaid expenses | (22) | (22)
Deferred tax assets liabilities gross | (8,101) | (8,516)
Valuation allowance | (8,572) | (9,106)
Net deferred income tax liabilities | $ (471) | $ (590)

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