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VESSELS AND EQUIPMENT, NET (Narrative) (Details) | 6 Months Ended
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Jun. 30, 2021 USD ($) vessel numberOfDrillingUnits drillingRig | Jun. 30, 2020 USD ($) vessel
Property, Plant and Equipment [Line Items] |  |
Number of vessels for which costs have been capitalized | vessel | 6 |
Number of drilling units | drillingRig | 2 |
Vessel impairment charge | $ 1,927,000 | $ 80,511,000
SFL Deepwater Ltd (“SFL Deepwater”) |  |
Property, Plant and Equipment [Line Items] |  |
Vessel impairment charge | 1,900,000 |
All vessels classified under vessels and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Vessel impairment charge | $ 0 |
handysize bulk carriers [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Vessel impairment charge |  | $ 80,300,000
Number of vessels for which impairment has been recognized | vessel |  | 7
West Linus |  |
Property, Plant and Equipment [Line Items] |  |
Number of drilling units reclassified from direct financing lease to vessels and equipment | numberOfDrillingUnits | 1 |
Cost | Vessels and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Capital improvements | $ 12,623,000 |
Reclassification from investments in direct financing leases | 355,635,000 |
Vessels and Equipment, net | Vessels and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Capital improvements | 12,623,000 |
Reclassification from investments in direct financing leases | $ 355,635,000 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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