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Note 12 - Properties and Equipment, Accrued Expenses, Other Current Liabilities and Other Liabilities - Summary of Property and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Vessels and related equipment | $ 929,723 |  | $ 940,175
Other properties and equipment | 15,548 |  | 16,861
Property, Plant and Equipment, Gross, Ending Balance | 945,271 |  | 957,036
Less accumulated depreciation and amortization | 190,564 |  | 176,718
Properties and equipment, net | $ 754,707 | $ 780,318 | $ 780,318

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- Definition Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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