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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 |  |

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