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Voyage and Vessel operating expenses (Tables)
 12 Months Ended
Dec. 31, 2016
Voyage and Vessel Operating Expenses [Abstract]  
Voyage expenses
 
 
 
2014
 
 
2015
 
 
2016
Voyage  expenses
 
 
 
 
 
 
 
 
 
Port charges                                               
 
$
5,132
 
$
17,619
 
$
30,229
Bunkers
 
 
33,146
 
 
48,535
 
 
28,121
Commissions - third parties
 
 
1,902
 
 
2,915
 
 
2,506
Commissions - related parties (Note 3)
 
 
1,997
 
 
3,350
 
 
3,300
Miscellaneous
 
 
164
 
 
458
 
 
1,665
Total voyage expenses                             
 
$
42,341
 
$
72,877
 
$
65,821
Vessel operating expenses
Vessel operating expenses
 
 
 
 
 
 
 
 
 
Crew wages and related costs                   
 
$
29,449
 
$
65,402
 
$
62,920
Insurances
 
 
4,561
 
 
8,026
 
 
6,124
Maintenance, repairs, spares and stores
 
 
9,415
 
 
18,577
 
 
17,194
Lubricants
 
 
3,901
 
 
8,187
 
 
6,372
Tonnage taxes
 
 
1,360
 
 
3,717
 
 
2,438
Upgrading expenses
 
 
3,167
 
 
6,205
 
 
1,784
Miscellaneous
 
 
1,243
 
 
2,682
 
 
1,998
Total vessel operating expenses            
 
$
53,096
 
$
112,796
 
$
98,830