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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue and Voyage Expense (Details) $ / item in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item $ / item | Dec. 31, 2016 USD ($) item
Voyage expense recognition |  |  |
Net gain (loss) on purchase and sale of bunker fuel and net realizable value adjustments | $ 3,000 | $ 2,021 | $ (4,920)
Number of vessels in vessel pools | item | 0 | 0 |
Other operating income | $ 0 | $ 0 | 960
Samsun | Bankruptcy settlement due |  |  |
Voyage expense recognition |  |  |
Other operating income |  |  | $ 934
Spot Market-Related Time Charter Agreement with Profit Sharing Element |  |  |
Voyage expense recognition |  |  |
Number of vessels under spot market-related time charters which include a profit-sharing element | item | 0 | 6 | 6
Floor price (in dollars per unit) | $ / item |  | 3 |
Allocation of excess profit sharing amount (as a percent) |  | 50.00% |

X
- Definition Represents the allocation of excess profit sharing amount, expressed as a percentage. + References No definition available. + Details
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- Definition Represents the daily floor rate of the charter agreement. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Represents the net gains (losses) resulting from the difference between the cost of bunker fuel delivered by the terminating charterer and the bunker fuel sold to the new charterer and the lower of cost and net realizable value adjustment to re-value bunker fuel on a quarterly basis. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Represents the number of vessels that were in the vessel pool on a specified date. + References No definition available. + Details
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- Definition Represents the number of vessels under spot market-related time charters, which include a profit-sharing element. + References No definition available. + Details
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- Definition The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Details
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- Details
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- Details
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Period Type: |