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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Concentration of credit risk (Details)
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12 Months Ended | ||
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Dec. 31, 2013
Customer
Derivative
Institution
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Dec. 31, 2012
Customer
Institution
Derivative
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Dec. 31, 2011
Customer
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| 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 | |
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Voyage Revenues [Member]
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| Concentration Risk [Line Items] | |||
| Major Customers | 3 | 1 | 2 |
| Concentration risk percentage (in hundredths) | 10.00% | 10.00% | 10.00% |
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Voyage Revenues [Member] | Cargill International S.A. [Member]
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| Concentration Risk [Line Items] | |||
| Concentration risk percentage (in hundredths) | 21.45% | 31.27% | 30.00% |
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Voyage Revenues [Member] | Swissmarine Services S.A. [Member]
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| Concentration Risk [Line Items] | |||
| Concentration risk percentage (in hundredths) | 18.73% | 12.23% | |
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Voyage Revenues [Member] | Pacific Basin Chartering Ltd [Member]
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| Concentration Risk [Line Items] | |||
| Concentration risk percentage (in hundredths) | 10.30% | ||