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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of credit risk (Details)	12 Months Ended
	Dec. 31, 2013 Customer Derivative Institution	Dec. 31, 2012 Customer Institution Derivative	Dec. 31, 2011 Customer
Concentration Risk [Line Items]
Percentage of revenue earned (in hundredths)	100.00%	100.00%	100.00%
Number of customers	48	43	32
Number of financial institutions with which the entity maintains its cash and cash equivalents	4	4
Number of interest swap agreements	4	5
Voyage Revenues [Member]
Concentration Risk [Line Items]
Major Customers	3	1	2
Concentration risk percentage (in hundredths)	10.00%	10.00%	10.00%
Voyage Revenues [Member] | Cargill International S.A. [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	21.45%	31.27%	30.00%
Voyage Revenues [Member] | Swissmarine Services S.A. [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	18.73%		12.23%
Voyage Revenues [Member] | Pacific Basin Chartering Ltd [Member]
Concentration Risk [Line Items]
Concentration risk percentage (in hundredths)	10.30%

X

- Definition

Represents the number customers of the entity from which revenue was earned.

+ References

No definition available.

+ Details

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X

- Definition

Represents the number of financial institutions with which the entity maintains its cash and cash equivalents.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of revenue earned from customers.

+ References

No definition available.

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X

- Definition

Represents the number of external customers from which the entity generated 10 percent or more of revenues.

+ References

No definition available.

+ Details

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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X

- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959

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