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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Common Stock | Accumulated Other Comprehensive (Loss) Income | 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 | $ 1,382 |  |  | 1,382
Shares issued for litigation settlement | $ 3,270 |  |  | 3,270
Shares issued for litigation settlement (in shares) | 1,000,000 |  |  |
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 Mexico mining concessions | $ 96 |  |  | 96
Shares issued for Mexico mining concessions (in shares) | 41,000 |  |  |
Unrealized loss on marketable securities |  | (1) |  | (1)
Unrealized (loss) gain on available-for-sale securities, net of taxes |  |  |  | (1)
Net loss |  |  | (147,742) | (147,742)
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 |  |  |  |
Shares issued for the settlement of accounts payable | $ 1,004 |  |  | 1,004
Shares issued for settlement of accounts payable (in shares) | 394,000 |  |  |
Stock-based compensation | $ 1,324 |  |  | 1,324
Exercise of stock options | $ 1,932 |  |  | $ 1,932
Exercise of stock options (in shares) | 1,499,000 |  |  | 1,499,000
Exercise of stock options assumed from Minera Andes Inc. acquisition | $ 360 |  |  | $ 360
Exercise of stock options assumed from Minera Andes Inc. acquisition (in shares) | 198,000 |  |  |
Shares issued to terminate TNR Gold Corp's back-in right | $ 1,352 |  |  | 1,352
Shares issued to terminate TNR Gold Corp's back-in right (in shares) | 850,000 |  |  |
Unrealized (loss) gain on available-for-sale securities, net of taxes |  | 419 |  | 419
Net loss |  |  | (311,943) | (311,943)
Balance at Dec. 31, 2014 | $ 1,360,668 | 124 | (919,577) | 441,215
Balance (in shares) at Dec. 31, 2014 | 300,100,000 |  |  |
Increase (Decrease) in Shareholders' Equity |  |  |  |
Shares issued for the settlement of accounts payable | $ 443 |  |  | 443
Shares issued for settlement of accounts payable (in shares) | 430,000 |  |  |
Stock-based compensation | $ 1,305 |  |  | 1,305
Share repurchase (note 10) | $ (1,769) |  |  | $ (1,769)
Share repurchase (note 10) (in shares) | (1,896,000) |  |  | (1,896,442)
Return of capital distribution (note 10) | $ (1,503) |  |  | $ (1,503)
Exercise of stock options (in shares) |  |  |  | 272,000
Unrealized (loss) gain on available-for-sale securities, net of taxes |  | (949) |  | $ (949)
Net loss |  |  | (20,450) | (20,450)
Balance at Dec. 31, 2015 | $ 1,359,144 | $ (825) | $ (940,027) | $ 418,292
Balance (in shares) at Dec. 31, 2015 | 298,634,000 |  |  |

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