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Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Financial Instruments (Details) (Textual) [Abstract]    
Average daily tanker rate over the remaining duration of the contract $ 29,564 $ 29,498
Discount rate over the remaining duration of contract 8.91% 8.68%