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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, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2012
Dec. 31, 2001
Total current assets $ 91,429 $ 20,170     $ 91,429  
Total non-current assets 41,636 160,433     41,636  
Total current liabilities 31,087 3,223     31,087  
Total non-current liabilities 635 36,157     635  
Total equity 101,343 141,223 58,342 38,837 101,343 1,614
Operating expense (33,713) 49,343 (19,539)   (63,696)  
Net loss (70,656) 51,546 (20,020) (61,254) (100,384)  
Midas Gold Corp [Member]
            
Total current assets 19,864 37,341     19,864  
Total non-current assets 175,957 119,126     175,957  
Total current liabilities 5,108 3,654     5,108  
Total non-current liabilities 380 563     380  
Total equity 190,333 152,250     190,333  
Operating expense 7,813 11,268        
Net loss $ 7,180 $ 13,438