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

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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