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Income Taxes - Deferred Tax Assets/Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Excess tax basis over book basis of property, plant, and equipment | $ 8,295 | $ 7,488
Marketable securities | 500 | 667
Operating loss carryforwards | 36,716 | 34,052
Capital loss carryforwards | 13,618 | 13,276
Other | 1,085 | 2,031
Total future tax assets | 60,214 | 57,514
Valuation allowance for future tax assets | (59,886) | (56,659)
Total income tax assets | 328 | 855
Other investments | 328 | 855
Total deferred income tax liabilities | $ 328 | $ 855

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