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Leases (Narrative) (Details)
Jun. 30, 2018
property
Charter-In [Member] | MR Vessel [Member]  
Leases [Line Items]  
Commitments to charter in vessels, Number of Units 4
Time Charters-In [Member] | Aframaxes [Member]  
Leases [Line Items]  
Commitments to charter in vessels, Number of Units 2