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Segment Reporting (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 93,627 $ 81,055 $ 108,350 $ 117,641
Accounts receivable and prepaid expenses 18,837 25,273    
Advances to affiliates 11,922 6,133    
Total assets 3,582,200 3,547,395    
Liquefied Gas Segment [Member]
       
Segment Reporting Information [Line Items]        
Total assets 2,911,659 2,866,541    
Conventional Tanker Segment [Member]
       
Segment Reporting Information [Line Items]        
Total assets $ 546,155 $ 568,393