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Derivative Instruments and Hedging Activities (Details 1) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011
Interest rate swap agreements |
Principal Amount | $ 5,009,661
Fair Value / Carrying Amount of Asset / (Liability) | (547,834)
U.S. Dollar-denominated interest rate swaps 1 [Member] |
Interest rate swap agreements |
Interest Rate Index | LIBOR
Principal Amount | 423,748
Fair Value / Carrying Amount of Asset / (Liability) | (119,895)
Weighted-Average Remaining Term (Years) | 25 years 1 month 6 days
Fixed Interest Rate (%) | 4.90%
U.S. Dollar-denominated interest rate swaps 2 [Member] |
Interest rate swap agreements |
Interest Rate Index | LIBOR
Principal Amount | 3,766,809
Fair Value / Carrying Amount of Asset / (Liability) | (561,747)
Weighted-Average Remaining Term (Years) | 8 years 4 months 24 days
Fixed Interest Rate (%) | 3.80%
U.S. Dollar-denominated interest rate swaps 3 [Member] |
Interest rate swap agreements |
Interest Rate Index | LIBOR
Principal Amount | 470,199
Fair Value / Carrying Amount of Asset / (Liability) | 159,603
Weighted-Average Remaining Term (Years) | 25 years 1 month 6 days
Fixed Interest Rate (%) | 4.80%
Euro-denominated interest rate swaps [Member] |
Interest rate swap agreements |
Interest Rate Index | EURIBOR
Principal Amount | 348,905
Fair Value / Carrying Amount of Asset / (Liability) | $ (25,795)
Weighted-Average Remaining Term (Years) | 12 years 6 months
Fixed Interest Rate (%) | 3.10%

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- Definition Monetary amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition Interest rate index. + References No definition available. + Details
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- Definition The average time remaining until maturity on the group of derivatives identified. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of the assets less the liabilities of a derivative or group of derivatives. + 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 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: 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 4: 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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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