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Inventories: (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Inventories (Table)

       December 31, 2019     June 30, 2020
Lubricants   $ 12,293   $ 12,896
Bunkers     38,860     34,276
Total   $ 51,153   $ 47,172