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Investments in Affiliated Companies (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investments in Affiliated Companies (Textual) [Abstract]      
Loans to affiliated companies $ 57.7 $ 47.7  
Distributions received from affiliates 35.3 54.7 36.0
Portion in dissolved Joint venture 45.00%    
Contribution for payment of outstanding debt on dissolution 62.1    
Fair Value of Vessels Received on Dissolution 88.8    
Impairment loss $ 5.2