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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue and Voyage Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Deferred revenue and revenue recognition |  |  |  |  |
Accrual related to estimated customer claims | $ 359 |  | $ 359 |  | $ 327
Voyage expense recognition |  |  |  |  |
Net gain (loss) on purchase and sale of bunker fuel and LCM adjustments | $ 1,034 | $ 1,440 | $ 1,889 | $ 935 |

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- 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 or market adjustment to re-value bunker fuel on a quarterly basis. + References No definition available. + Details
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