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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Accumulated Other Comprehensive (Loss) Income
Accumulated Deficit
Balance at Dec. 31, 2012 $ 889,591 $ 1,349,777 $ (294) $ (459,892)
Balance (in shares) at Dec. 31, 2012   296,025    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 378 378    
Exercise of stock options 34 34    
Exercise of stock options (in shares)   20    
Shares issued for litigation settlement 3,270 3,270    
Shares issued for litigation settlement (in shares)   1,000    
Shares issued for Mexico mining concessions 96 96    
Shares issued for Mexico mining concessions (in shares)   41    
Net income (loss) (10,982)     (10,982)
Balance at Mar. 31, 2013 882,387 1,353,555 (294) (470,874)
Balance (in shares) at Mar. 31, 2013   297,086    
Balance at Dec. 31, 2013 746,767 1,354,696 (295) (607,634)
Balance (in shares) at Dec. 31, 2013   297,159    
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 380 380    
Unrealized gain on available-for-sale securities, net of taxes 1   1  
Net income (loss) 17,887     17,887
Balance at Mar. 31, 2014 $ 765,035 $ 1,355,076 $ (294) $ (589,747)
Balance (in shares) at Mar. 31, 2014   297,159