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Fair Value Accounting (Assets Measured At Fair Value By Level Within The Fair Value Hierarchy) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cash Equivalents $ 1,000 $ 3,000
Marketable securities 161 176
Available-for-sale Securities 8,060 20,990
Amayapampa interest 4,813 4,813
Mill Equipment 6,500 6,500
Fair Value, Inputs, Level 1 [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Cash Equivalents 1,000 3,000
Marketable securities 161 176
Available-for-sale Securities 8,060 20,990
Fair Value, Inputs, Level 3 [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Mill Equipment $ 6,500 $ 6,500