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CONTINGENCIES (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2016 USD ($) TankBarge Lawsuit	Jun. 30, 2016 USD ($) TankBarge Lawsuit Plaintiff
Guarantor Obligations [Line Items]
Issued guaranties	$ 18,061,000	$ 18,061,000
Maximum [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, expiration period	4 years
Performance Bonds [Member]
Guarantor Obligations [Line Items]
Issued guaranties	$ 13,668,000	$ 13,668,000
Collision with M/S Summer Wind [Member]
Loss Contingencies [Line Items]
Number of tank barges | TankBarge	2	2
Number of vessels damaged in collision resulting in fuel oil discharge | TankBarge	1	1
Number of actions filed against the Company | Lawsuit	2	2
Number of crewmembers alleging damages | Plaintiff		2
Standby Letters Of Credit [Member]
Guarantor Obligations [Line Items]
Issued guaranties	$ 4,393,000	$ 4,393,000

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- Definition

Refers to number of tank barges.

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- Definition

Term of the guarantee or each group of financial instruments used to support performance by the company and its subsidiaries in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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Number of pending claims pertaining to a loss contingency.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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