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VESSELS AND EQUIPMENT UNDER FINANCE LEASE, NET - Narrative (Details) - vessels	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Finance lease, number of leased assets	2	2
Finance lease, remaining lease term	6 years	6 years
Weighted average discount rate (percent)	7.50%

X

- Definition

Finance Lease, Remaining Lease Term

+ References

No definition available.

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- Definition

Lessee, Finance Lease, Number Of Leased Assets

+ References

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X

- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(4)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 55
-Paragraph 53
-URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971

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