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Vessels, detail 2 (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Movement in Property, Plant and Equipment [Roll Forward] |  |  |
Vessels' cost, beginning balance | $ 166,218 | $ 93,531 |
Acquisitions and other vessel's costs | 114,594 | 72,687 |
Vessels' cost, ending balance | 280,812 | 166,218 | 93,531
Movement in Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment [Roll Forward] |  |  |
Accumulated depreciation, beginning balance | (7,391) | (1,454) |
Depreciation for the period | (12,476) | (5,937) | (1,454)
Accumulated depreciation, ending balance | (19,867) | (7,391) | (1,454)
Property, Plant and Equipment, Net, by Type [Abstract] |  |  |
Vessels' net book value, beginning balance | 158,827 | 92,077 |
Vessel's net book value, ending balance | $ 260,945 | $ 158,827 | $ 92,077

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