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INVESTMENTS IN SALES-TYPE LEASES, DIRECT FINANCING LEASES AND LEASEBACK ASSETS (Narrative) (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 vessel | Jul. 31, 2021 vessel | Jun. 30, 2021 vessel | Dec. 31, 2020 USD ($) vessel
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels accounted for as leaseback assets | 6 |  |  |
Four River Box vessels |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Equity method investment, number of chartered-in vessels |  |  |  | 4
Subsequent Event |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels, exercise of put options |  | 3 |  |
Landbridge Universal Limited |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Term of lease or charter | 7 years |  |  |
Term of lease or charter, purchase obligation period | 7 years |  |  |
MSC |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Term of lease or charter | 6 years |  |  |
Number of vessels accounted for as leaseback assets | 3 |  |  |
Hunter Group ASA |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Term of lease or charter | 5 years |  |  |
Number of container vessels accounted for as leaseback assets | 3 |  |  | 3
Disposal Group, Disposed of by Sale, Not Discontinued Operations | River Box Holding Inc. ("River Box") |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Subsidiary, percentage ownership sold (in percentage) |  |  |  | 50.10%
West Linus |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Direct financing lease, net investment in lease | $ |  |  |  | $ 361.0
Sales-Type Leases And Direct Financing Leases |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels under investments in sales-type leases, direct financing leases and leaseback assets |  |  | 27 | 28
Sales-Type Leases And Direct Financing Leases | MSC |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels under investments in sales-type leases, direct financing leases and leaseback assets |  |  | 15 |
Term of lease or charter | 7 years |  |  |
Number of vessels under investments in sales-type leases, direct financing leases and leaseback assets, delivered |  |  | 3 |
Leaseback Assets |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of vessels under investments in sales-type leases, direct financing leases and leaseback assets |  |  | 4 | 4

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