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Voyage and Vessel operating expenses (Tables) | 12 Months Ended
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Dec. 31, 2017
Voyage and Vessel Operating Expenses [Abstract] |
Voyage expenses |
|  |  | 2015 |  |  | 2016 |  |  | 2017
Voyage expenses |  |  |  |  |  |  |  |  |
Port charges |  | $ | 17,619 |  | $ | 30,229 |  | $ | 21,060
Bunkers |  |  | 48,535 |  |  | 28,121 |  |  | 34,997
Commissions - third parties |  |  | 2,915 |  |  | 2,506 |  |  | 3,438
Commissions - related parties (Note 3) |  |  | 3,350 |  |  | 3,300 |  |  | 3,300
Miscellaneous |  |  | 458 |  |  | 1,665 |  |  | 1,887
Total voyage expenses |  | $ | 72,877 |  | $ | 65,821 |  | $ | 64,682
Vessel operating expenses |
Vessel operating expenses |  |  |  |  |  |  |  |  |
Crew wages and related costs |  | $ | 65,402 |  | $ | 62,920 |  | $ | 63,074
Insurances |  |  | 8,026 |  |  | 6,124 |  |  | 6,314
Maintenance, repairs, spares and stores |  |  | 18,577 |  |  | 17,194 |  |  | 18,589
Lubricants |  |  | 8,187 |  |  | 6,372 |  |  | 7,016
Tonnage taxes |  |  | 3,717 |  |  | 2,438 |  |  | 2,565
Upgrading expenses |  |  | 6,205 |  |  | 1,784 |  |  | 1,925
Miscellaneous |  |  | 2,682 |  |  | 1,998 |  |  | 1,945
Total vessel operating expenses |  | $ | 112,796 |  | $ | 98,830 |  | $ | 101,428

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