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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock | Accumulated Other Comprehensive (Loss) Income | Accumulated Deficit
--- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 219,304 | $ 613,831 | $ (1,289) | $ (393,238)
Balance (in shares) at Dec. 31, 2011 |  | 139,753,000 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 2,845 | 2,845 |  |
Issuance of exchangeable shares to acquire Minera Andes Inc. | 664,671 | 664,671 |  |
Issuance of exchangeable shares to acquire Minera Andes Inc. (in shares) |  | 127,331,000 |  |
Assumption of stock options in connection with the acquisition of Minera Andes Inc. | 3,175 | 3,175 |  |
Exercise of stock options | 721 | 721 |  |
Exercise of stock options (in shares) |  | 387,000 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition | 2,844 | 2,844 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) |  | 942,000 |  |
Shares issued for Mexico mining concessions | 391 | 391 |  |
Shares issued for Mexico mining concessions (in shares) |  | 83,000 |  |
Unrealized (loss) gain on available-for-sale securities, net of taxes | (2) |  | (2) |
Reclassification of unrealized loss on marketable equity securities disposed of during the period, net of tax | (993) |  | (993) |
Other-than-temporary impairment on marketable equity securities | 1,993 |  | 1,993 |
Net loss (adjusted - note 6) | (40,369) |  |  | (40,369)
Balance at Sep. 30, 2012 | 854,580 | 1,288,478 | (291) | (433,607)
Balance (in shares) at Sep. 30, 2012 |  | 268,496,000 |  |
Balance at Dec. 31, 2012 | 889,591 | 1,349,777 | (294) | (459,892)
Balance (in shares) at Dec. 31, 2012 |  | 296,025,000 |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Stock-based compensation | 965 | 965 |  |
Exercise of stock options | 95 | 95 |  |
Exercise of stock options (in shares) | 48,000 | 48,000 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition | 76 | 76 |  |
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) |  | 45,000 |  |
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) | 41,500 | 41,000 |  |
Unrealized (loss) gain on available-for-sale securities, net of taxes | 3 |  | 3 |
Net loss (adjusted - note 6) | (136,399) |  |  | (136,399)
Balance at Sep. 30, 2013 | $ 757,697 | $ 1,354,279 | $ (291) | $ (596,291)
Balance (in shares) at Sep. 30, 2013 |  | 297,159,000 |  |

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