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Voyage and Vessel operating expenses (Tables)
 12 Months Ended
Dec. 31, 2015
Voyage and Vessel Operating Expenses [Abstract]  
Voyage expenses
 
 
 
2013
 
 
2014
 
 
2015
Voyage  expenses
 
 
 
 
 
 
 
 
 
Port charges                                               
 
$
1,455
 
$
5,132
 
$
17,619
Bunkers
 
 
4,338
 
 
33,146
 
 
48,535
Commissions - third parties
 
 
867
 
 
1,902
 
 
2,915
Commissions - related parties (Note 3)
 
 
773
 
 
1,997
 
 
3,350
Miscellaneous
 
 
116
 
 
164
 
 
458
Total voyage expenses                             
 
$
7,549
 
$
42,341
 
$
72,877
Vessel operating expenses
Vessel operating expenses
 
 
 
 
 
 
 
 
 
Crew wages and related costs                   
 
$
14,355
 
$
29,449
 
$
65,402
Insurances
 
 
2,968
 
 
4,561
 
 
8,026
Maintenance, repairs, spares and stores
 
 
5,772
 
 
9,415
 
 
18,577
Lubricants
 
 
2,339
 
 
3,901
 
 
8,187
Tonnage taxes
 
 
797
 
 
1,360
 
 
3,717
Upgrading expenses
 
 
205
 
 
3,167
 
 
6,205
Miscellaneous
 
 
651
 
 
1,243
 
 
2,682
Total vessel operating expenses            
 
$
27,087
 
$
53,096
 
$
112,796