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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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- References

No definition available.

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- Definition

Represents the estimated scrap value of vessels.

+ References

No definition available.

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- Definition

Represents the estimated useful life of vessels.

+ References

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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

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