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Other Operational Gain - Additional Information (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended			12 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2011 Commercial Claim [Member]	Dec. 31, 2010 Commercial Claim [Member]	Jun. 30, 2012 Hull And Machinery Claim [Member]	Jun. 30, 2011 Hull And Machinery Claim [Member]
Other Operational Gain [Line Items]
Other operational gain (Note 9)	$ 140	$ 9,240	$ 9,000	$ 5,000	$ 140	$ 240

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- Definition

Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.4)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 4

-Article 7

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