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Voyage and Vessel operating expenses
 12 Months Ended
Dec. 31, 2018
Costs and Expenses [Abstract]  
Voyage and Vessel operating expenses

17.       Voyage and Vessel operating expenses:

The amounts in the consolidated statements of operations are analyzed as follows:

    2016   2017   2018
Voyage  expenses            
Port charges                                                $ 30,229 $ 21,060 $ 37,215
Bunkers   28,121   34,997   72,287
Commissions – third parties   2,506   3,438   6,179
Commissions – related parties (Note 3)   3,300   3,300   3,400
Miscellaneous   1,665   1,887   2,515
Total voyage expenses                              $ 65,821 $ 64,682 $ 121,596
              
Vessel operating expenses            
Crew wages and related costs                    $ 62,920 $ 63,074 $ 80,360
Insurances   6,124   6,314   7,544
Maintenance, repairs, spares and stores   17,194   18,589   26,368
Lubricants   6,372   7,016   8,494
Tonnage taxes   2,438   2,565   1,506
Pre-delivery and Pre-joining expenses   1,784   1,925   1,234
Miscellaneous   1,998   1,945   3,366
Total vessel operating expenses             $ 98,830 $ 101,428 $ 128,872