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Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended
Mar. 05, 2015
T
Dec. 31, 2014
item
Subsequent Event [Line Items]    
Number of vessels classified as held for sale written down to fair value   4ish_NumberOfVesselsClassifiedAsHeldForSaleWrittenDownToFairValue
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Weight of vessel sold 36,000ish_WeightOfVessel
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Proceeds from sale of other assets $ 3.0us-gaap_ProceedsFromSaleOfOtherAssets1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember