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Income Taxes (Deferred Tax Assets/Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |
Excess tax basis over book basis of property, plant, and equipment | $ 7,773 | $ 7,785 | $ 7,893
Marketable securities | 713 | 862 | 798
Operating loss carryforwards | 27,943 | 26,464 | 35,001
Capital loss carryforwards | 13,469 | 13,463 | 10,212
Other | 1,783 | 2,725 | 2,891
Total future tax assets | 51,681 | 51,299 | 56,795
Valuation allowance for future tax assets | (50,209) | (50,816) | (54,397)
Total income tax assets | 1,472 | 483 | 2,398
Other investments | 1,472 | 483 | 1,916
Amayapampa disposal consideration |  |  | 482
Total deferred income tax liabilities | $ 1,472 | $ 483 | $ 2,398

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