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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

Number of vessels written down as part of impairment recorded during the period.

+ References

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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

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