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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock [Member]
Accumulated Other Comprehensive Income [Member]
Retained Earnings [Member]
Total
Balance at Dec. 31, 2012 $ 1,349,777 $ (294) $ (459,892) $ 889,591
Balance (in shares) at Dec. 31, 2012 296,025,000      
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 686     686
Exercise of stock options 95     95
Exercise of stock options (in shares) 48,000      
Shares issued for litigation settlement 3,270     3,270
Shares issued for litigation settlement (in shares) 1,000,000      
Shares issued for Mexico mining concessions 96     96
Shares issued for Mexico mining concessions (in shares) 41,000      
Net loss     (139,663) (139,663)
Balance at Jun. 30, 2013 1,353,924 (294) (599,555) 754,075
Balance (in shares) at Jun. 30, 2013 297,114,000      
Balance at Dec. 31, 2013 1,354,696 (295) (607,634) 746,767
Balance (in shares) at Dec. 31, 2013 297,159,000      
Increase (Decrease) in Shareholders' Equity        
Stock-based compensation 609     609
Exercise of stock options 129     129
Exercise of stock options (in shares) 60,000     60,300
Unrealized gain on available-for-sale securities, net of taxes   3   3
Net loss     (86,135) (86,135)
Balance at Jun. 30, 2014 $ 1,355,434 $ (292) $ (693,769) $ 661,373
Balance (in shares) at Jun. 30, 2014 297,220,000