| Vessels, Port Terminals and other fixed assets |
Vessels, Port Terminals and Other Fixed Assets, net | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2019 | | $ | 1,809,195 | | | $ | (532,681 | ) | | $ | 1,276,514 | | Additions | | | 2,209 | | | | (32,287 | ) | | | (30,078 | ) | Impairment losses | | | (67,511 | ) | | | 47,958 | | | | (19,553 | ) | Vessel disposals | | | (23,078 | ) | | | — | | | | (23,078 | ) | Write offs | | | (549 | ) | | | 77 | | | | (472 | ) | Vessel acquisitions | | | 96,678 | | | | (1,014 | ) | | | 95,664 | | Balance June 30, 2020 | | $ | 1,816,944 | | | $ | (517,947 | ) | | $ | 1,298,997 | |
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