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Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Vessels [Line Items]      
Vessels' depreciation method Straight-line basis    
Vessel's useful life 25 years    
Vessel impairment loss $ 0 $ 303,219 $ 62,020