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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Vessels, net (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) $ / item | Jun. 30, 2017 USD ($)
Vessels, net |  |  |  |
Estimated useful life |  |  | 25 years |
Depreciation and amortization | $ 16,450 | $ 18,185 | $ 33,336 | $ 36,358
Estimated scrap value (in dollars per lightweight ton) | $ / item |  |  | 310 |
Vessels |  |  |  |
Vessels, net |  |  |  |
Depreciation and amortization | $ 15,246 | $ 16,892 | $ 30,919 | $ 33,598

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- Definition Represents the estimated scrap value of vessels. + References No definition available. + Details
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- Definition Represents the estimated useful life of vessels. + References No definition available. + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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