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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other:
Advances to joint venture partner (note 6)	$ 13,931	$ 10,200
Long-term debt (note 7)	(1,533,652)	(1,315,231)
Carrying Amount Asset (Liability) [Member] | Other [Member]
Other:
Advances to joint venture partner (note 6)	13,931	10,200
Carrying Amount Asset (Liability) [Member] | Level 1 [Member] | Recurring [Member]
Estimated fair value and carrying value of those assets and liabilities that are measured at fair value on a recurring and non-recurring basis as well as the estimated fair value of the Partnership's financial instruments that are not accounted for at a fair value on a recurring basis
Cash and cash equivalents and restricted cash	641,621	589,261
Carrying Amount Asset (Liability) [Member] | Level 2 [Member] | Recurring [Member] | Interest Rate Swap Agreement [Member]
Derivative instruments (note 10)
Interest rate swap agreements- assets	166,527	159,603
Swap agreements	(326,229)	(304,066)
Carrying Amount Asset (Liability) [Member] | Level 2 [Member] | Recurring [Member] | Cross currency swap agreement [Member]
Derivative instruments (note 10)
Swap agreements	(10,220)
Carrying Amount Asset (Liability) [Member] | Level 2 [Member] | Other [Member]
Other:
Long-term debt (note 7)	(1,533,652)	(1,315,231)
Carrying Amount Asset (Liability) [Member] | Level 3 [Member] | Recurring [Member]
Derivative instruments (note 10)
Other derivative	(300)	(600)
Fair Value Asset (Liability) [Member] | Level 1 [Member] | Recurring [Member]
Estimated fair value and carrying value of those assets and liabilities that are measured at fair value on a recurring and non-recurring basis as well as the estimated fair value of the Partnership's financial instruments that are not accounted for at a fair value on a recurring basis
Cash and cash equivalents and restricted cash	641,621	589,261
Fair Value Asset (Liability) [Member] | Level 2 [Member] | Recurring [Member] | Interest Rate Swap Agreement [Member]
Derivative instruments (note 10)
Interest rate swap agreements- assets	166,527	159,603
Swap agreements	(326,229)	(304,066)
Fair Value Asset (Liability) [Member] | Level 2 [Member] | Recurring [Member] | Cross currency swap agreement [Member]
Derivative instruments (note 10)
Swap agreements	(10,220)
Fair Value Asset (Liability) [Member] | Level 2 [Member] | Other [Member]
Other:
Long-term debt (note 7)	(1,397,849)	(1,191,117)
Fair Value Asset (Liability) [Member] | Level 3 [Member] | Recurring [Member]
Derivative instruments (note 10)
Other derivative	$ (300)	$ (600)

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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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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