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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
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)