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Income Taxes - Deferred Tax Assets/Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Excess tax basis over book basis of property, plant, and equipment | $ 7,488 | $ 7,488
Marketable securities | 667 | 771
Operating loss carryforwards | 34,052 | 28,530
Capital loss carryforwards | 13,276 | 13,470
Other | 2,031 | 1,848
Total future tax assets | 57,514 | 52,107
Valuation allowance for future tax assets | (56,659) | (51,406)
Total income tax assets | 855 | 701
Other investments | 855 | 701
Total deferred income tax liabilities | $ 855 | $ 701

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