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Segment Reporting (Details 1) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]        
Cash and cash equivalents $ 114,916 $ 93,627 $ 74,508 $ 81,055
Accounts receivable and prepaid expenses 15,783 18,837    
Advances to affiliates 24,362 11,922    
Consolidated total assets 3,790,346 3,582,200    
Liquefied Gas Segment [Member]
       
Segment Reporting Information [Line Items]        
Total assets 3,103,704 2,911,659    
Conventional Tanker Segment [Member]
       
Segment Reporting Information [Line Items]        
Total assets $ 531,581 $ 546,155