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Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Income Taxes [Abstract] |  |
Stock-based compensation | $ 613 | $ 251
Investment |  | 781
Net operating loss | 17,194 | 13,626
Interest limitation carryforward | 441 |
Alternative minimum tax credit | 1,049 | 2,705
Other | 995 | 943
Total long-term deferred tax assets | 20,292 | 18,306
Coal properties | (46,733) | (47,034)
Net deferred tax liability | $ (26,441) | $ (28,728)

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