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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data, unless otherwise specified
Common Stock
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
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 965     965
Exercise of stock options 171     171
Exercise of stock options (in shares) 93,000      
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      
Unrealized gain on available-for-sale securities, net of taxes   3   3
Net loss     (136,399) (136,399)
Balance at Sep. 30, 2013 1,354,279 (291) (596,291) 757,697
Balance (in shares) at Sep. 30, 2013 297,159,000      
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 852     852
Exercise of stock options 1,382     1,382
Exercise of stock options (in shares) 697,000     697,300
Shares issued for settlement of accounts payable 1,004     1,004
Number of shares issued to settle part of account payables (in shares) 393,190,000     393,190
Unrealized gain on available-for-sale securities, net of taxes   1   1
Net loss     (99,168) (99,168)
Balance at Sep. 30, 2014 $ 1,357,934 $ (294) $ (706,802) $ 650,838
Balance (in shares) at Sep. 30, 2014 298,249,000