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Vessels and other fixed assets, net (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Schedule of vessels and other fixed assets, net

    Vessel cost   Accumulated depreciation   Net Book Value
Balance, December 31, 2017   2,186,856   -411,775   1,775,081
- Transfer from advances for vessels under construction and acquisition of vessels         163,138                     -            163,138
- Acquisitions, improvements and other vessel costs         844,474                     -            844,474
- Vessel disposal/ transfer to Held for sale           (5,949)                     -              (5,949)
- Impairment loss         (83,256)             65,472         (17,784)
- Depreciation for the period                    -           (102,852)       (102,852)
Balance, December 31, 2018 $ 3,105,263 $ -449,155 $ 2,656,108
- Transfer from advances for vessels under construction and acquisition of vessels         157,589                     -            157,589
- Acquisitions, improvements and other vessel costs         335,671                     -            335,671
- Vessel disposal       (163,049)          106,899         (56,150)
- Impairment loss         (24,551)             21,140           (3,411)
- Depreciation for the period                    -           (124,280)       (124,280)
Balance, December 31, 2019 $ 3,410,923 $      (445,396) $ 2,965,527