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Other Investments (Summary Of Financial Information For Midas) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 132 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2001
Total current assets $ 9,844 $ 91,429     $ 91,429  
Total non-current assets 43,250 41,636     41,636  
Total current liabilities 1,222 31,087     31,087  
Total non-current liabilities 8,859 635     635  
Total equity 43,013 101,343 141,223 58,342 101,343 1,614
Operating expense (22,149) (33,537) 49,234   (85,615)  
Net loss (59,488) (70,656) 51,546 (81,274) (159,872)  
Midas Gold Corp [Member]
            
Total current assets 14,742 19,864     19,864  
Total non-current assets 186,673 175,957     175,957  
Total current liabilities 2,432 5,108     5,108  
Total non-current liabilities 919 380     380  
Total equity 198,064 190,333     190,333  
Operating expense 3,908 7,813        
Net loss $ 3,796 $ 7,180