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Voyage and Vessel Operating Expenses (Tables)
 12 Months Ended
Dec. 31, 2014
Voyage and Vessel Operating Expenses [Abstract]  
Voyage expenses
 
 
 
2012
 
 
2013
 
 
2014
 
Voyage  expenses
 
 
 
 
 
 
 
 
 
 
Port charges                                               
 
$
2,484
 
$
1,455
 
$
5,132
 
Bunkers
 
 
10,788
 
 
4,338
 
 
33,146
 
Commissions - third parties
 
 
947
 
 
867
 
 
1,902
 
Commissions - related parties (Note 3)
 
 
1,134
 
 
773
 
 
1,997
 
Chartered-in vessel expenses
 
 
4,050
 
 
-
 
 
-
 
Miscellaneous
 
 
195
 
 
116
 
 
164
 
Total voyage expenses                             
 
$
19,598
 
$
7,549
 
$
42,341
 
Vessel operating expenses
Vessel operating expenses
 
 
 
 
 
 
 
 
 
 
Crew wages and related costs                   
 
$
14,498
 
$
14,355
 
$
29,449
 
Insurances
 
 
2,655
 
 
2,968
 
 
4,561
 
Maintenance, repairs, spares and stores
 
 
6,779
 
 
5,772
 
 
9,415
 
Lubricants
 
 
3,046
 
 
2,339
 
 
3,901
 
Tonnage taxes
 
 
169
 
 
797
 
 
1,360
 
Upgrading expenses
 
 
19
 
 
205
 
 
3,167
 
Miscellaneous
 
 
666
 
 
651
 
 
1,243
 
Total vessel operating expenses            
 
$
27,832
 
$
27,087
 
$
53,096