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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net and Deferred revenue (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) item $ / item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 17, 2020 item
Summary of Significant Accounting Policies |  |  |  |
Due from charterers, reserve | $ 669 | $ 1,064 |  |
Accrual related to estimated customer claims | 358 | 577 |  |
Charter hire expenses | $ 10,307 | 16,179 | $ 1,534 |
Vessels, net |  |  |  |
Estimated useful life | 25 years |  |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item | 310 |  |  |
Depreciation and amortization | $ 65,168 | 72,824 | 68,976 |
Number of vessels held for exchange | item | 5 |  |  |
Vessels held for exchange | $ 38,214 |  |  |
Contract Liability | 7,200 |  |  |
Deferred drydocking costs |  |  |  |
Amortization expense for drydocking | $ 5,598 | 5,484 | 4,629 |
Agreement To Exchange Vessels | Handysize Vessels |  |  |  |
Vessels, net |  |  |  |
Number of vessels to be exchanged | item |  |  |  | 6
Number of vessels exchanged | item | 1 |  |  |
Agreement To Exchange Vessels | Ultramax Vessels |  |  |  |
Vessels, net |  |  |  |
Contract Liability | $ 7,200 |  |  |
Number of vessels to be exchanged | item |  |  |  | 3
Number of vessels exchanged | item | 1 |  |  |
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 |  |  |
Vessels |  |  |  |
Vessels, net |  |  |  |
Depreciation and amortization | $ 58,008 | 66,351 | 64,012 |
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 |  |  |
Detail of Fixed Assets, Excluding Vessels |  |  |  |
Vessels, net |  |  |  |
Depreciation and amortization | $ 1,562 | $ 989 | $ 335 |

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