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Other Investments (Summary Of Financial Information For Midas) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 96 Months Ended 132 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2012
Dec. 31, 2010
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   101,343 58,342 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