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Equity Method Investments (Details Textual) (USD $) | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2007 Building | Feb. 28, 2011 Carrier | Dec. 31, 2010 | Nov. 30, 2010 | Dec. 31, 2009 | Dec. 31, 2011 RasGas Three [Member] | Dec. 31, 2011 Excalibur and Excelsior [Member] | Nov. 04, 2010 Excalibur and Excelsior [Member] | Dec. 31, 2011 Angola LNG Carriers [Member] Vessel
Equity Method Investments (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |
Estimate of Possible Loss | $ 191,448,000 |  |  | $ 172,898,000 |  | $ 93,320,000 | $ 97,400,000 | $ 56,100,000 |  | $ 12,800,000
Percentage of ownership in joint venture |  |  |  |  | 50.00% |  | 40.00% | 50.00% | 50.00% | 33.00%
Assumed total ownership of equity method investments |  |  |  |  |  |  |  | 100.00% |  |
Guarantee of debt |  |  |  |  |  |  |  | $ 45,400,000 |  | $ 218,000,000
Number of LNG carriers |  | 4 | 6 |  |  |  |  |  |  | 3
Fixed-rate charter period | 15 years | 20 years |  |  |  |  |  |  |  | 20 years

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