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Vessels (Tables)
6 Months Ended
Jun. 30, 2015
Property Plant And Equipment [Abstract]  
Schedule Of Property Plant And Equipment [Table Text Block]
  Vessels' Cost Accumulated Depreciation Net Book Value
      
Balance, December 31, 2014$ 333,078$ (26,984)$ 306,094
- Acquisitions and other vessels' costs  $37,218  -  37,218
- Depreciation for the period  -  (5,953)  (5,953)
Balance, June 30, 2015$ 370,296$ (32,937)$ 337,359