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RELATED PARTY TRANSACTIONS (Schedule of fees with related parties) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Related Party Transaction [Line Items]
Vessel operating expenses - related parties	$ 14,740	$ 15,250
Administrative expenses - related parties	154	587
Frontline Shipping
Related Party Transaction [Line Items]
Vessel operating expenses - related parties	4,249	4,592
Newbuilding Supervision Fees	16	0
Commissions and Brokerage	96	178
Administrative expenses - related parties	59	37
Golden Ocean
Related Party Transaction [Line Items]
Vessel operating expenses - related parties	10,136	10,192
Administrative expenses - related parties	33	32
Operating Management Fees	355	466
Seatankers
Related Party Transaction [Line Items]
Administrative expenses - related parties	113	206
Credit note	(300)
Seatankers Management AS
Related Party Transaction [Line Items]
Office facilities	54	47
Frontline Management AS
Related Party Transaction [Line Items]
Office facilities	118	96
Frontline Corporate Services
Related Party Transaction [Line Items]
Office facilities	$ 71	$ 169

X

- Definition

The aggregate total of expenses paid to related parties in connection with administering the affairs of an entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Commission And Brokerage Expenses

+ References

No definition available.

+ Details

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Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Credit Note

+ References

No definition available.

+ Details

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Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Newbuilding Supervision Fees

+ References

No definition available.

+ Details

Name:	sfl_NewbuildingSupervisionFees
Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Related Party, Operating Management Fees

+ References

No definition available.

+ Details

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Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Management fees paid to a related party during the period for the provision of office facilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The aggregate direct operating costs, including management fees, of operating the vessels that are paid to related parties.

+ References

No definition available.

+ Details

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Namespace Prefix:	sfl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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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X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sfl_SeatankersManagementASMember
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Data Type:	na
Balance Type:
Period Type:

X

- Details

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Period Type:

X

- Details

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