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Loss On Sale Of Assets (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment [Line Items]  
Loss on Sale of Other Assets $ 68,000us-gaap_GainLossOnSaleOfOtherAssets
Loss on Extinguishment of Debt 95,000us-gaap_GainsLossesOnExtinguishmentOfDebt
Handysize Vessel [Member]  
Property, Plant and Equipment [Line Items]  
Proceeds from sale of other assets 16,400,000us-gaap_PaymentsForProceedsFromProductiveAssets
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ish_HandysizeVesselMember
Weight of vessel sold 36,000ish_WeightOfVessel
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ish_HandysizeVesselMember
Related debt paid off $ 13,500,000us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= ish_HandysizeVesselMember