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FINANCIAL INSTRUMENTS (Schedule of concentration of revenue risk) (Details) - vessel	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Golden Ocean Group Limited ("Golden Ocean")
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Number of chartered vessels	8
Golden Ocean Group Limited ("Golden Ocean") | Sales Revenue, Net | Customer Concentration Risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	12.00%	11.00%
MSC
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Number of chartered vessels	28
MSC | Sales Revenue, Net | Customer Concentration Risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	3.00%	13.00%
Maersk Line A/S (“Maersk”)
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Number of chartered vessels	12
Maersk Line A/S (“Maersk”) | Sales Revenue, Net | Customer Concentration Risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	33.00%	28.00%
Evergreen
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Number of chartered vessels	4
Evergreen | Sales Revenue, Net | Customer Concentration Risk
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	15.00%	14.00%

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- Definition

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+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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