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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
The estimated fair value of financial instruments that are measured at fair value on a recurring basis
Long-term debt (note 10)	$ (1,315,231)	$ (1,399,115)
Carrying Amount Asset (Liability) [Member]
The estimated fair value of financial instruments that are measured at fair value on a recurring basis
Cash and cash equivalents and restricted cash	589,261	653,193
Advances to and from affiliates and joint venture	(5,478)	(127,218)
Long-term debt (note 10)	(1,315,231)	(1,399,115)
Advances to and from joint venture partners (note 8)	10,200	10,141
Carrying Amount Asset (Liability) [Member] | Level 2 [Member] | Interest Rate Swap Agreement [Member]
Derivative instruments (note 13)
Interest rate swap agreements- assets	159,603	66,870
Interest rate swap agreements- liabilities	(304,066)	(201,463)
Carrying Amount Asset (Liability) [Member] | Level 3 [Member]
Derivative instruments (note 13)
Other derivative	(600)	(10,000)
Fair Value Asset (Liability) [Member]
The estimated fair value of financial instruments that are measured at fair value on a recurring basis
Cash and cash equivalents and restricted cash	589,261	653,193
Advances to and from affiliates and joint venture	(5,478)	(127,218)
Long-term debt (note 10)	(1,191,117)	(1,292,026)
Fair Value Asset (Liability) [Member] | Level 2 [Member] | Interest Rate Swap Agreement [Member]
Derivative instruments (note 13)
Interest rate swap agreements- assets	159,603	66,870
Interest rate swap agreements- liabilities	(304,066)	(201,463)
Fair Value Asset (Liability) [Member] | Level 3 [Member]
Derivative instruments (note 13)
Other derivative	$ (600)	$ (10,000)

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Advances to and from affiliates and joint ventures.

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Unsecured advances to and from joint venture partners.

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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