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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Net operating losses $ 5,992 $ 7,288
Environmental and closure reserves 2,158 3,189
Depreciation and amortization 907
Other 1,252 2,285
Depreciation and amortization (162)
Goodwill and indefinite lived intangible assets (1,694) (2,362)
Prepaid expenses (50) (72)
Deferred tax assets liabilities gross 8,565 10,166
Valuation allowance (10,259) (12,528)
Net deferred income tax liabilities $ (1,694) $ (2,362)