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Segment Reporting (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Segment reporting information profit (loss)        
Voyage revenues $ 96,354 $ 92,247 $ 195,570 $ 185,466
Voyage expenses 242 685 585 1,055
Vessel operating expenses 20,104 23,388 40,635 44,195
Depreciation and amortization 24,673 22,171 49,306 44,520
General and administrative 6,506 6,535 13,622 12,861
Income from vessel operations 44,829 39,468 91,422 82,835
Liquefied Gas Segment [Member]
        
Segment reporting information profit (loss)        
Voyage revenues 67,602 65,885 138,336 131,678
Voyage expenses 30 61 66 70
Vessel operating expenses 10,717 13,145 21,529 24,222
Depreciation and amortization 17,309 15,081 34,547 30,205
General and administrative 4,099 3,941 8,626 7,265
Income from vessel operations 35,447 33,657 73,568 69,916
Conventional Tanker Segment [Member]
        
Segment reporting information profit (loss)        
Voyage revenues 28,752 26,362 57,234 53,788
Voyage expenses 212 624 519 985
Vessel operating expenses 9,387 10,243 19,106 19,973
Depreciation and amortization 7,364 7,090 14,759 14,315
General and administrative 2,407 2,594 4,996 5,596
Income from vessel operations $ 9,382 $ 5,811 $ 17,854 $ 12,919