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Income Tax (Deferred Tax Assets/Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 30, 2011
--- | --- | --- | --- | ---
Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |  |
Excess tax basis over book basis of property, plant, and equipment | $ 7,496 | $ 8,001 | $ 6,011 |
Deferred Tax Assets, Marketable securities | 661 | 62 |  |
Operating loss carryforwards | 36,367 | 37,635 | 26,772 |
Capital loss carryforwards | 5,474 | 2,630 | 2,645 |
Other | 1,541 | 3,219 | 2,023 |
Unrealized foreign exchange on loans | 79 | 217 | 676 |
Deferred Tax Assets, Gross, Total | 51,618 | 51,764 | 38,127 |
Valuation allowance for future tax assets | (43,955) | (41,817) | (29,291) | (6,086)
Deferred Tax Assets, Net | 7,663 | 9,947 | 8,836 |
Deferred Tax Liabilities, Marketable securities |  |  | 14,092 |
Other investments | 7,181 | 24,839 | 29,784 |
Amayapampa disposal consideration | 482 | 482 | 482 |
Deferred Income Tax Liabilities, Gross | 7,663 | 25,321 | 44,358 |
Total Deferred Taxes |  | $ (15,374) | $ (35,522) |

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