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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)