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Advances for vessels under construction and acquisition of vessels (Tables)
12 Months Ended
Dec. 31, 2018
Advances for vessels under construction and acquisition of vessels [Abstract]  
Advances for vessels under construction and acquisition of vessels
    December 31, 2017 December 31, 2018
             
Pre-delivery yard installments   $ 30,402   $ 8,700
Fair value of the share consideration for OCC Vessels                            -        42,962
Bareboat capital leases – upfront hire     10,460      -
Capitalized interest     4,753     1,307
Other capitalized costs     2,959     2,034
Advances for secondhand vessels                            -        4,897
Total   $ 48,574   $ 59,900