Vessels And Other Fixed Assets (Schedule of Vessels) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Vessels and Other Fixed Assets [Abstract]
Cost, Beginning Balance	$ 764,905	$ 678,725
Cost, Additions	88,505	86,180
Cost, Ending Balance	853,410	764,905
Accumulated Depreciation, Beginning Balance	(97,692)	(66,367)
Depreciation for the period	(34,327)	(31,325)
Accumulated Depreciation, Ending Balance	(132,019)	(97,692)
Net Book Value, Beginning Balance	667,213	612,358
Net Book Value, Additions	54,178	54,855
Net Book Value, Ending Balance	$ 721,391	$ 667,213

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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