| Vessels, Port Terminals, Tanker Vessels, Barges, Push boats and other fixed assets |
Vessels | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | 1,814,965 | | | $ | (536,518) | | | $ | 1,278,447 | | Additions | | | 398 | | | | (66,405) | | | | (66,007) | | Vessel impairment | | | (411,265) | | | | 212,399 | | | | (198,866) | | Disposals | | | (101,717) | | | | — | | | | (101,717) | | Vessel acquisition | | | 22,385 | | | | (458) | | | | 21,927 | | Balance December 31, 2018 | | | 1,324,766 | | | | (390,982) | | | | 933,784 | | Additions | | | 4,747 | | | | (48,812) | | | | (44,065) | | Vessel impairment | | | (274,067) | | | | 159,834 | | | | (114,233) | | Disposals | | | (48,830) | | | | — | | | | (48,830) | | Vessel acquisition | | | 14,735 | | | | (44) | | | | 14,691 | | Balance December 31, 2019 | | | 1,021,351 | | | | (280,004) | | | | 741,347 | | Additions | | | 1,277 | | | | (36,438) | | | | (35,161) | | Vessel impairment | | | (221,754) | | | | 137,255 | | | | (84,499) | | Disposals | | | (87,823) | | | | — | | | | (87,823) | | Vessel acquisition | | | 96,678 | | | | (2,820) | | | | 93,858 | | Write offs | | | (153) | | | | — | | | | (153) | | Balance December 31, 2020 | | $ | 809,576 | | | $ | (182,007) | | | $ | 627,569 | |
Port Terminals (Navios Logistics) | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | 251,641 | | | $ | (32,628 | ) | | $ | 219,013 | | Additions | | | 2,530 | | | | (7,284 | ) | | | (4,754 | ) | Transfers from oil storage plant and port facilities for liquid cargoes | | | (629 | ) | | | — | | | | (629 | ) | Transfers to other long-term assets | | | (26 | ) | | | — | | | | (26 | ) | Disposals | | | (156 | ) | | | 137 | | | | (19 | ) | Balance December 31, 2018 | | | 253,360 | | | | (39,775) | | | | 213,585 | | Additions | | | 602 | | | | (7,186) | | | | (6,584) | | Balance December 31, 2019 | | | 253,962 | | | | (46,961) | | | | 207,001 | | Additions | | | 869 | | | | (7,216) | | | | (6,347) | | Write offs | | | (87) | | | | 76 | | | | (11) | | Balance December 31, 2020 | | $ | 254,744 | | | $ | (54,101) | | | $ | 200,643 | |
Tanker vessels, barges and pushboats (Navios Logistics) | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | 472,081 | | | $ | (164,056 | ) | | $ | 308,025 | | Additions | | | 3,581 | | | | (18,528 | ) | | | (14,947 | ) | Transfers | | | 629 | | | | — | | | | 629 | | Transfers from deposits for vessels, port terminal and other fixed assets, net | | | 49,421 | | | | — | | | | 49,421 | | Balance December 31, 2018 | | | 525,712 | | | | (182,584 | ) | | | 343,128 | | Additions | | | 2,403 | | | | (19,038) | | | | (16,635) | | Write offs | | | (2,064) | | | | 866 | | | | (1,198) | | Balance December 31, 2019 | | | 526,051 | | | | (200,756) | | | | 325,295 | | Additions | | | 1,931 | | | | (18,278) | | | | (16,347) | | Write offs | | | (308) | | | | — | | | | (308) | | Balance December 31, 2020 | | $ | 527,674 | | | $ | (219,034) | | | $ | 308,640 | |
Containerships (Navios Containers) | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | — | | | $ | — | | | $ | — | | Vessels upon obtaining control | | | 376,133 | | | | (882 | ) | | | 375,251 | | Vessel acquisition | | | 24,763 | | | | (35 | ) | | | 24,728 | | Balance December 31, 2018 | | | 400,896 | | | | (917 | ) | | | 399,979 | | Additions | | | 1,715 | | | | (7,497) | | | | (5,782) | | Vessel acquisition | | | 53,097 | | | | (649) | | | | 52,448 | | Navios Containers Deconsolidation | | | (455,708) | | | | 9,063 | | | | (446,645) | | Balance December 31, 2019 | | | — | | | | — | | | | — | |
Other fixed assets | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | 14,360 | | | $ | (10,620 | ) | | $ | 3,740 | | Additions | | | 5,845 | | | | (1,572 | ) | | | 4,273 | | Write offs | | | (329) | | | | 295 | | | | (34) | | Balance December 31, 2018 | | | 19,876 | | | | (11,897 | ) | | | 7,979 | | Additions | | | 2,161 | | | | (1,056 | ) | | | 1,105 | | Write offs | | | (14,206 | ) | | | 7,993 | | | | (6,213) | | Balance December 31, 2019 | | | 7,831 | | | | (4,960 | ) | | | 2,871 | | Additions | | | 488 | | | | (672 | ) | | | (184) | | Balance December 31, 2020 | | $ | 8,319 | | | $ | (5,632 | ) | | $ | 2,687 | |
Total | | Cost | | | Accumulated Depreciation | | | Net Book Value | | Balance December 31, 2017 | | $ | 2,553,047 | | | $ | (743,822 | ) | | $ | 1,809,225 | | Vessels upon obtaining control | | | 376,133 | | | (882 | ) | | | 375,251 | | Additions | | | 12,354 | | | (93,789 | ) | | | (81,435 | ) | Vessel acquisition | | | 47,148 | | | (493 | ) | | | 46,655 | | Vessel impairment | | | (411,265 | ) | | 212,399 | | | | (198,866 | ) | Vessel disposals | | | (101,717 | ) | | — | | | | (101,717 | ) | Disposals | | | (156 | ) | | 137 | | | | (19 | ) | Write offs | | | (329 | ) | | 295 | | | | (34 | ) | Transfers from deposits for vessels, port terminals and other fixed assets | | | 49,421 | | | — | | | | 49,421 | | Transfers to other long-term assets | | | (26 | ) | | — | | | | (26 | ) | Balance December 31, 2018 | | | 2,524,610 | | | (626,155 | ) | | | 1,898,455 | | Additions | | | 11,628 | | | (83,589) | | | | (71,961) | | Vessel acquisition | | | 67,832 | | | (693) | | | | 67,139 | | Vessel impairment | | | (274,067) | | | 159,834 | | | | (114,233) | | Vessel disposals | | | (48,830) | | | — | | | | (48,830) | | Write offs | | | (16,270) | | | 8,859 | | | | (7,411) | | Navios Containers Deconsolidation | | | (455,708) | | | 9,063 | | | | (446,645) | | Balance December 31, 2019 | $ | | 1,809,195 | | $ | (532,681) | | | $ | 1,276,514 | | Additions | | | 4,565 | | | (62,604) | | | | (58,039) | | Vessel acquisition | | | 96,678 | | | (2,820) | | | | 93,858 | | Vessel impairment | | | (221,754) | | | 137,255 | | | | (84,499) | | Vessel disposals | | | (87,823) | | | — | | | | (87,823) | | Write offs | | | (548) | | | 76 | | | | (472) | | Balance December 31, 2020 | $ | | 1,600,313 | | $ | (460,774) | | | $ | 1,139,539 | |
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