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FAIR VALUE OF FINANCIAL INSTRUMENTS - NONRECURRING (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) item
Fair value of financial instruments |  |
Impairment of vessel assets | $ 0 | $ 56,402
Fair Value, Measurements, Nonrecurring |  |
Fair value of financial instruments |  |
Number of vessels written down as part of impairment | item |  | 9
Fair Value, Measurements, Nonrecurring | Level 3 |  |
Fair value of financial instruments |  |
Impairment of vessel assets | $ 0 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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