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Vessels and Other Fixed Assets, Net (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Balance, period start | $ 2,716,008 |  |
Transfer from advances for vessels under construction and acquisition of vessels | (157,589) | $ (163,138) |
Acquisitions, improvements and other vessel costs | 96,671 | 129,749 |
Impairment loss | 3,411 | 17,784 | $ 0
Depreciation for the period | (124,280) | (102,852) | (82,623)
Balance, period end | 2,965,527 | 2,716,008 |
Vessel cost |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Balance, period start | 3,105,263 | 2,186,856 |
Transfer from advances for vessels under construction and acquisition of vessels | 157,589 | 163,138 |
Acquisitions, improvements and other vessel costs | 335,671 | 844,474 |
Vessel disposal/ transfer to Held for sale | (163,049) | (5,949) |
Impairment loss | (24,551) | (83,256) |
Balance, period end | 3,410,923 | 3,105,263 | 2,186,856
Accumulated depreciation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Balance, period start | (449,155) | (411,775) |
Vessel disposal | 106,899 |  |
Impairment loss | 21,140 | 65,472 |
Depreciation for the period | (124,280) | (102,852) |
Balance, period end | (445,396) | (449,155) | (411,775)
Net Book Value |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Balance, period start | 2,656,108 | 1,775,081 |
Transfer from advances for vessels under construction and acquisition of vessels | 157,589 | 163,138 |
Acquisitions, improvements and other vessel costs | 335,671 | 844,474 |
Vessel disposal/ transfer to Held for sale | (56,150) | (5,949) |
Impairment loss | (3,411) | (17,784) |
Depreciation for the period | (124,280) | (102,852) |
Balance, period end | $ 2,965,527 | $ 2,656,108 | $ 1,775,081

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