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Earnings / (loss) per share (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Basic and Diluted Earnings Per Share | The information related to basic and diluted earnings per share is as follows:
|  | 2010 |  |  | 2011 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss from continuing operations |  | $ | (2,306 | ) |  | $ | (3,747 | ) |  | $ | (678 | )
Net profit/loss from discontinued operations |  |  | (44,333 | ) |  |  | (9,712 | ) |  |  | 9,430 |
Net profit/(loss) |  | $ | (46,639 | ) |  | $ | (13,459 | ) |  | $ | 8,752 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares outstanding — Basic |  |  | 20,796,789 |  |  |  | 20,994,015 |  |  |  | 22,545,989 |
— Diluted |  |  | 20,796,789 |  |  |  | 20,994,015 |  |  |  | 22,784,302 |
Earnings / (loss) per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | (0.11 | ) |  | $ | (0.18 | ) |  | $ | (0.03 | )
Discontinued operations |  | $ | (2.13 | ) |  | $ | (0.46 | ) |  | $ | 0.42 |
|  | $ | (2.24 | ) |  | $ | (0.64 | ) |  | $ | 0.39 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  | $ | (0.11 | ) |  | $ | (0.18 | ) |  | $ | (0.03 | )
Discontinued operations |  | $ | (2.13 | ) |  | $ | (0.46 | ) |  | $ | 0.41 |
|  | $ | (2.24 | ) |  | $ | (0.64 | ) |  | $ | 0.38 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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