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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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Assumed total ownership of equity method investments.

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Length of charter contract.

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Number of LNG carriers.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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