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Voyage and Vessel operating expenses
 12 Months Ended
Dec. 31, 2019
Costs and Expenses [Abstract]  
Voyage and Vessel operating expenses

19.       Voyage and Vessel operating expenses:

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

    Years ended December 31, 
      2017     2018     2019
Voyage  expenses                  
Port charges                                                  $ 21,060   $ 37,215   $ 63,576
Bunkers     34,997     72,287     146,089
Commissions – third parties      3,438     6,179     6,828
Commissions – related parties (Note 3)     3,300     3,400     3,850
Miscellaneous     1,887     2,515     2,619
Total voyage expenses                                $ 64,682   $ 121,596   $ 222,962
                    
Vessel operating expenses                  
Crew wages and related costs                      $ 63,074   $ 80,360   $ 103,701
Insurances     6,314     7,544     10,311
Maintenance, repairs, spares and stores     18,589     26,368     25,675
Lubricants     7,016     8,494     9,833
Tonnage taxes     2,565     1,506     2,087
Pre-delivery and Pre-joining expenses     1,925     1,234     1,507
Miscellaneous     1,945     3,366     6,948
Total vessel operating expenses               $ 101,428   $ 128,872   $ 160,062