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Voyage and Vessel operating expenses (Tables)
 12 Months Ended
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