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Advances for vessels under construction and acquisition of vessels (Tables)
6 Months Ended
Jun. 30, 2019
Advances for vessels under construction and acquisition of vessels [Abstract]  
Advances for vessels under construction and acquisition of vessels
Balance, December 31, 2018 $ 59,900
- Additions   65,202
- Capitalized interest   629
- Transfers to Vessel cost   (104,528)
Balance, June 30, 2019   21,203