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Income Tax (Deferred Tax Assets/Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Apr. 30, 2011 | Dec. 31, 2010
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |  |  |
Excess tax basis over book basis of property, plant, and equipment | $ 8,001 | $ 6,011 |  | $ 6,495
Deferred Tax Assets, Marketable securities | 62 |  |  |
Operating loss carryforwards | 37,635 | 26,772 |  | 20,945
Capital loss carryforwards | 2,630 | 2,645 |  | 2,773
Other | 3,219 | 2,023 |  | 1,407
Unrealized foreign exchange on loans | 217 | 676 |  | 864
Deferred Tax Assets, Gross, Total | 51,764 | 38,127 |  | 32,484
Valuation allowance for future tax assets | (41,817) | (29,291) | (6,086) | (31,886)
Deferred Tax Assets, Net | 9,947 | 8,836 |  | 598
Deferred Tax Liabilities, Marketable securities |  | 14,092 |  | 116
Other investments | 24,839 | 29,784 |  |
Amayapampa disposal consideration | 482 | 482 |  | 482
Deferred Income Tax Liabilities, Gross | 25,321 | 44,358 |  | 598
Total Deferred Taxes | $ (15,374) | $ (35,522) |  |

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