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Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Total	$ 5,444,373	$ 4,432,064
Less current portion	401,376	276,508
Long-term debt (note 8)	5,042,997	4,155,556
Line of Credit [Member]
Debt Instrument [Line Items]
Total	2,244,634	1,697,237
Senior Notes (8.875%) due July 15, 2011 [Member]
Debt Instrument [Line Items]
Total		16,201
Senior Notes (8.5%) due January 15, 2020 [Member]
Debt Instrument [Line Items]
Total	446,825	446,559
Norwegian Kroner-denominated Bonds due November 2013 [Member]
Debt Instrument [Line Items]
Total	100,417	103,061
U.S.Dollar-denominated Term Loans due through 2021 [Member]
Debt Instrument [Line Items]
Total	2,069,860	1,782,423
U.S. Dollar-denominated Term Loan Variable Interest Entity due October [Member]
Debt Instrument [Line Items]
Total	220,450
Euro-denominated Term Loans due through 2023 [Member]
Debt Instrument [Line Items]
Total	348,905	373,301
U.S. Dollar-denominated Unsecured Demand Loan due to Joint Venture [Member]
Debt Instrument [Line Items]
Total	$ 13,282	$ 13,282

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Amounts due from an entity in which the reporting entity shares joint control with another party or group, due after 1 year (or 1 business cycle).

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Total of the portions of the carrying amounts as of the balance sheet date of long-term debt, which may include notes payable, bonds payable, debentures, mortgage loans, and commercial paper, which are scheduled to be repaid within one year or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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