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Note 12 - Properties and Equipment, Accrued Costs and Expenses, Other Current Liabilities and Other Liabilities - Summary of Property and Equipment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Vessels and related equipment | $ 968,411 | $ 1,051,558
Other properties and equipment | 15,674 | 13,119
Property, Plant and Equipment, Gross, Ending Balance | 984,085 | 1,064,677
Less accumulated depreciation and amortization | 163,209 | 125,716
Properties and equipment, net | $ 820,876 | $ 938,961

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