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Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Property Plant and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Vessels and related equipment | $ 940,175 | $ 1,051,558
Other properties and equipment | 16,861 | 13,119
Property, Plant and Equipment, Gross, Ending Balance | 957,036 | 1,064,677
Less accumulated depreciation and amortization | 176,718 | 125,716
Net properties and equipment | $ 780,318 | $ 938,961

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