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FAIR VALUE OF FINANCIAL INSTRUMENTS - NONRECURRING (Details)	3 Months Ended
	Mar. 31, 2018 item
Fair Value, Measurements, Nonrecurring
Fair value of financial instruments
Number of vessels written down as part of impairment	9

X

- Definition

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

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: