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Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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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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- 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 -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FIN39-1 -Paragraph 10A, 10B -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 16 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 + Details
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