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Derivative Instruments and Hedging Activities (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Realized (losses) gains relating to:
Derivative instruments not designated as hedging instruments realized gain (loss) net	$ (272,596)	$ (164,286)	$ (138,213)
Unrealized (losses) gains relating to:
Derivative instruments not designated as hedging instruments unrealized gain (loss) net	(70,126)	(135,312)	278,259
Total realized and unrealized (losses) gains on non-designated derivative instruments	(342,722)	(299,598)	140,046
Interest Rate Swap Agreements [Member]
Realized (losses) gains relating to:
Derivative instruments not designated as hedging instruments realized gain (loss) net	(132,931)	(154,098)	(127,936)
Unrealized (losses) gains relating to:
Derivative instruments not designated as hedging instruments unrealized gain (loss) net	(58,405)	(146,780)	258,710
Interest rate swap resets and terminations [Member]
Realized (losses) gains relating to:
Derivative instruments not designated as hedging instruments realized gain (loss) net	(149,666)
Foreign currency forward contracts [Member]
Realized (losses) gains relating to:
Derivative instruments not designated as hedging instruments realized gain (loss) net	9,965	(2,274)	(8,984)
Unrealized (losses) gains relating to:
Derivative instruments not designated as hedging instruments unrealized gain (loss) net	(11,399)	6,307	14,797
Forward freight agreements, bunker fuel swap contracts and other [Member]
Realized (losses) gains relating to:
Derivative instruments not designated as hedging instruments realized gain (loss) net	36	(7,914)	(1,293)
Unrealized (losses) gains relating to:
Derivative instruments not designated as hedging instruments unrealized gain (loss) net		(108)	4,167
Foinaven embedded derivative [Member]
Unrealized (losses) gains relating to:
Derivative instruments not designated as hedging instruments unrealized gain (loss) net	$ (322)	$ 5,269	$ 585

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- Definition

Derivative instruments not designated as hedging instruments realized gain loss net.

+ References

No definition available.

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- Definition

Derivative instruments not designated as hedging instruments unrealized gain loss net.

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- Definition

Net gain (loss) from the increase (decrease) in fair value of derivative instrument not designated as hedging instrument.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(1)(b)

-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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

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