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Earnings per share, textuals (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Earnings Per Share [Abstract] |  |  |
Unvested shares granted under the company's incentive plan | 79,998 | 146,662 | 159,996
Dividends declared and paid during the period | $ 28,545 | $ 4,154 |

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