| Vessels, Port Terminals, Tanker Vessels, Barges, Push boats and other fixed assets |
| | | | | | | | | | | | | Vessels, Port Terminals and Other Fixed Assets, net | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | 2,553,047 | | | $ | (743,822 | ) | | $ | 1,809,225 | | Additions | | | 5,111 | | | | (47,818) | | | | (42,707) | | Impairment losses | | | (48,007) | | | | 35,926 | | | | (12,081) | | Vessel disposals | | | (7,682) | | | | — | | | | (7,682) | | Other disposals | | | (156) | | | | 137 | | | | (19) | | Write offs | | | (34) | | | | — | | | | (34) | | Vessel acquisition | | | 10,255 | | | | (53) | | | | 10,202 | | Transfers from deposits for vessels, port terminal and other fixed assets, net | | | 32,032 | | | | — | | | | 32,032 | | Balance June 30, 2018 | | $ | 2,544,566 | | | $ | (755,630) | | | $ | 1,788,936 | | | | | | | | | | | | | | |
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