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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net and Deferred revenue (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) $ / item | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Vessels, net |  |  |  |  |
Estimated useful life |  |  | 25 years |  |
Estimated scrap value (in dollars per lightweight ton) | $ / item |  |  | 310 |  |
Depreciation and amortization | $ 18,184 | $ 17,269 | $ 54,532 | $ 50,605 |
Accrual related to estimated customer claims | 511 |  | 511 |  | $ 345
Vessels |  |  |  |  |
Vessels, net |  |  |  |  |
Depreciation and amortization | $ 16,649 | $ 16,013 | $ 49,834 | $ 46,933 |

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- References No definition available. + Details
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