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Significant Accounting Policies-Addittional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Significant Accounting Policies_Vessels, Net [Abstract]    
Estimated scrap rate $0.300 per lightweight ton Approximately $0.250 per light weight ton
Estimated useful life 30 years  
Decrease in depreciation expense $ 2,692  
Increase in net income $ 2,692  
Increase in per common share, basic and diluted $ 0.04