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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Due from charterers, net |  |  |
Due from charterers, reserve | $ 246 | $ 283 |
Accrual related to estimated customer claims | $ 327 | 220 |
Vessels, net |  |  |
Estimated useful life | 25 years |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item | 310 |  |
Fixed assets, net |  |  |
Depreciation and amortization | $ 71,776 | 76,330 | $ 79,556
Deferred drydocking costs |  |  |
Amortization expense for drydocking | $ 4,988 | 4,113 | 2,877
Minimum |  |  |
Deferred drydocking costs |  |  |
Period for which vessels are required to be drydocked for major repairs and maintenance | 30 months |  |
Maximum |  |  |
Deferred drydocking costs |  |  |
Period for which vessels are required to be drydocked for major repairs and maintenance | 60 months |  |
Detail of Fixed Assets, Excluding Vessels |  |  |
Fixed assets, net |  |  |
Depreciation and amortization | $ 274 | 388 | 284
Furniture and fixtures |  |  |
Fixed assets, net |  |  |
Useful lives | 5 years |  |
Vessel equipment | Minimum |  |  |
Fixed assets, net |  |  |
Useful lives | 2 years |  |
Vessel equipment | Maximum |  |  |
Fixed assets, net |  |  |
Useful lives | 15 years |  |
Computer equipment |  |  |
Fixed assets, net |  |  |
Useful lives | 3 years |  |
Vessels |  |  |
Fixed assets, net |  |  |
Depreciation and amortization | $ 66,514 | $ 71,829 | $ 76,395

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