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

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