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Vessels, Net, detail (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item vessel	Dec. 31, 2018 USD ($) vessel	Dec. 31, 2017 USD ($) vessel
Vessel Cost
Beginning Balance	$ 1,272,351	$ 1,211,869
Transfer from Advances for vessels	39,725	60,482
Ending Balance	1,312,076	1,272,351	$ 1,211,869
Accumulated Depreciation
Beginning Balance	(317,060)	(268,993)
Depreciation	(50,310)	(48,067)	(51,424)
Ending Balance	(367,370)	(317,060)	(268,993)
Net Book Value
Beginning Balance	955,291	942,876
Transfer from Advances for vessels	39,725	60,482
Depreciation	(50,310)	(48,067)	(51,424)
Ending Balance	$ 944,706	$ 955,291	$ 942,876
Number of impaired vessels | vessel	0	0	4
Number of vessels provided as collateral | item	32
Vessels provided as collateral	$ 701,780
Number of vessels sold and leased back | vessel	8
Carrying value of vessels sold and leased back	$ 214,907

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Number Of Impaired Vessels

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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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The carrying amount, as of the date of the latest financial statement presented, of vessels formerly owned by our respective subsidiaries that had been sold to third parties and taken back on a bareboat charter basis with either an obligation to purchase them back at the end of the respective charter period or an option to buy them during the respective charter period.

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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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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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