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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net and Deferred revenue (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Vessels, net |  |  |
Estimated useful life | 25 years |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item | 310 |  |
Depreciation and amortization | $ 72,824 | $ 68,976 | $ 71,776
Deferred drydocking costs |  |  |
Amortization expense for drydocking | 5,484 | 4,629 | 4,988
Due from charterers, reserve | 1,064 | 669 |
Charter hire expenses | 16,179 | 1,534 | 0
Accrual related to estimated customer claims | $ 577 | 345 |
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 |  |
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 |  |  |
Vessels, net |  |  |
Depreciation and amortization | $ 66,351 | 64,012 | 66,514
Detail of Fixed Assets, Excluding Vessels |  |  |
Vessels, net |  |  |
Depreciation and amortization | $ 989 | $ 335 | $ 274

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