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Basis of presentation and Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of Drydocking activity
Balance at January 1	$ 2,019,576
Cost incurred for drydocking	(19,638)	(12,727)	(9,729)
Balance at December 31	2,021,125	2,019,576
Drydocking Activity [Member]
Summary of Drydocking activity
Balance at January 1	24,393	20,477	15,257
Cost incurred for drydocking	19,638	12,727	9,729
Sale of vessel		(1,477)
Dry-dock amortization	(9,582)	(7,334)	(4,509)
Balance at December 31	$ 34,449	$ 24,393	$ 20,477

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- Definition

Payments for vessel drydocking.

+ References

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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Current year divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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