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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Inventories:

4.       Inventories:

The amounts shown in the consolidated balance sheets are analyzed as follows:

       December 31, 2017     December 31, 2018
Lubricants   $ 7,604   $ 12,071
Bunkers     11,741     15,365
Total   $ 19,345   $ 27,436