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Vessels, Net, detail (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Vessel Cost
Beginning Balance	$ 1,211,869	$ 1,324,800
Transfer from Advances for vessels	60,482	67,504
Disposal		(20,630)
Impairment loss		(159,805)
Ending Balance	1,272,351	1,211,869	$ 1,324,800
Accumulated Depreciation
Beginning Balance	(268,993)	(286,081)
Impairment loss		68,512
Depreciation	(48,067)	(51,424)	(49,485)
Ending Balance	(317,060)	(268,993)	(286,081)
Net Book Value
Beginning Balance	942,876	1,038,719
Transfer from Advances for vessels	60,482	67,504
Disposal		(20,630)
Impairment loss		(91,293)
Depreciation	(48,067)	(51,424)	(49,485)
Ending Balance	$ 955,291	$ 942,876	$ 1,038,719
Number of vessels provided as collateral | item	39
Vessels provided as collateral	$ 914,804

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- Definition

The aggregate amount of write-downs for impairments, reprezenting the difference between the gross book value and fair value less cost to sell, recognized during the period for property, plant and equipment for abandonment, exchange or sale.

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The carrying amount, as of the date of the latest financial statement presented, of vessels that are pledged as collateral to secure the related debt obligations.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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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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Amount of divestiture 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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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

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Amount of increase (decrease) of physical assets used in the normal conduct of business and not intended for resale, from reclassification, impairment, donation, or changes classified as other. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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