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Changes in capital accounts, detail 2 (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders Equity Note [Abstract] |  |  |  |
Issuance of common stock, net of issuance costs, shares |  | 9,115,803 |  |
Per share value of common stock issued | $ 1.00 | $ 6.25 | $ 7.50 | $ 15.00
Issuance of common stock, net of issuance costs |  | $ 53,901 | $ 121,492 | $ 85,281
Rights exercised |  | 0 | 0 |

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