The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References+ Details

Adjustments to gains or losses attributable to an extraordinary item recognized in a prior period. This element is gross of the related tax effect.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 30

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 225

-SubTopic 20

-Section 45

-Paragraph 13

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 20

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=6904752&loc=d3e14619-107780

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 23

-URI http://asc.fasb.org/extlink&oid=6368906&loc=d3e21914-107793

Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 154

-Paragraph 25, 26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

Out of Period Adjustments (Details) (Oslo Bulk AS [Member], USD $)	3 Months Ended			12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Dec. 31, 2012	Jul. 31, 2011	Dec. 31, 2009
Oslo Bulk AS [Member]
Schedule of Equity Method Investments [Line Items]
Equity investee ownership interest (in hundredths)				25.00%	25.00%	25.00%
Amount of ineffectiveness on investment hedges	$ 674,000	$ 42,000
Out of period adjustments related to net charter revenues and lease termination			239,000	(324,000)
Decrease to pre-tax income				(85,000)
Increase to net income				631,000
Adjustment from out of period	$ 631,000