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Basis of Presentation (Narrative) (Details)
Sep. 30, 2018
property
Vessel/Fleet [Member]  
Property, Plant and Equipment [Line Items]  
Number of vessels in fleet 52
Charter In Vessels [Member]  
Property, Plant and Equipment [Line Items]  
Number of vessels in fleet 6
Vessels with Interest In [Member]  
Property, Plant and Equipment [Line Items]  
Number of vessels in fleet 6