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Segment Reporting (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Segment reporting information profit (loss)      
Revenues $ 379,975 $ 374,008 $ 343,048
Voyage expenses 1,387 2,042 2,034
Vessel operating expenses 89,046 84,577 82,374
Depreciation and amortization 91,919 89,347 82,686
General and administrative (note 12a and 12b) 24,120 23,247 19,764
Gain on sale of vessel (note 17a)   (4,340)  
Restructuring charge (note 18) 0 175 3,250
Income from vessel operations 173,503 178,960 152,940
Segment reporting information additional information      
Equity income (note 19) 20,584 8,043 27,639
Investments in and advances to joint ventures (note 19) 191,448 172,898 93,320
Total assets 3,457,814 3,434,934 3,430,210
Expenditures for vessels and equipment 64,685 26,652 134,926
Expenditures for drydock 19,638 12,727 9,729
Liquefied Gas Segment [Member]
      
Segment reporting information profit (loss)      
Revenues 269,408 264,816 252,854
Voyage expenses (87) 29 1,018
Vessel operating expenses 47,773 46,496 50,919
Depreciation and amortization 62,889 60,954 59,088
General and administrative (note 12a and 12b) 13,385 12,239 11,033
Gain on sale of vessel (note 17a)   (4,340)  
Restructuring charge (note 18)     1,381
Income from vessel operations 145,448 149,438 129,415
Segment reporting information additional information      
Equity income (note 19) 20,584 8,043 27,639
Investments in and advances to joint ventures (note 19) 191,448 172,898 93,320
Total assets 2,911,659 2,866,541 2,846,685
Expenditures for vessels and equipment 63,686 24,095 133,563
Expenditures for drydock 13,831 2,014 8,409
Conventional Tanker Segment [Member]
      
Segment reporting information profit (loss)      
Revenues 110,567 109,192 90,194
Voyage expenses 1,474 2,013 1,016
Vessel operating expenses 41,273 38,081 31,455
Depreciation and amortization 29,030 28,393 23,598
General and administrative (note 12a and 12b) 10,735 11,008 8,731
Restructuring charge (note 18)   175 1,869
Income from vessel operations 28,055 29,522 23,525
Segment reporting information additional information      
Total assets 546,155 568,393 583,525
Expenditures for vessels and equipment 999 2,557 1,363
Expenditures for drydock $ 5,807 $ 10,713 $ 1,320