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Vessel Sales and Write-downs (Details Textual) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2011
Vessel
Dec. 31, 2010
Dec. 31, 2009
Vessel
Feb. 28, 2010
1992 built Aframax tanker [Member]
Jul. 31, 2009
1992 built Aframax tanker [Member]
Vessel
Aug. 31, 2010
1995 built Aframax [Member]
Apr. 30, 2010
1995 built Aframax [Member]
Aug. 31, 2010
1990 built product Tanker [Member]
Nov. 30, 2010
2000 built LPG Tanker [Member]
Mar. 31, 2011
1988-built FSO unit [Member]
Feb. 28, 2009
2009 built product tanker and 1993 built Aframax Tanker [Member]
Dec. 31, 2011
2009 built product tanker and 1993 built Aframax Tanker [Member]
May 31, 2009
2007 built product tanker and 2005 built product tanker [Member]
Sep. 30, 2009
1989 built product tanker [Member]
Dec. 31, 2010
Shuttle Equipment [Member]
Dec. 31, 2011
Shuttle Equipment [Member]
Dec. 31, 2011
PTH [Member]
Vessel Sales and Write Downs on Vessels and Equipment (Textual) [Abstract]                                  
Realized gain (loss) on sale of tanker       $ (200,000)   $ (1,900,000)     $ 4,300,000 $ (200,000) $ 17,700,000   $ 29,800,000        
Proceeds from sale of tankers 33,424,000 70,958,000 219,834,000     17,200,000 17,300,000 4,000,000 21,600,000                
Deferred gain loss on sale of tanker                     17,600,000            
Amortization Period of Deferred Gain on sale of tanker                       4 years          
Written down for impairment of vessels 155,920,000 19,432,000 24,221,000   7,100,000                 4,000,000 19,400,000    
Number of vessel held for sale 2                                
Number of vessels sold at their written down value         2                        
Number of vessels value written down for impairment     3                            
Written down estimated fair value 112,100,000                             36,900,000  
Written Down of Investments                                 $ 19,400,000
Number of impaired vessels sold     2                            
Percentage of Joint venture interests 33.00%                               50.00%