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COMMITMENTS AND CONTINGENT LIABILITIES (Details) shares in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) vessel shares | Dec. 31, 2020 USD ($) vessel shares | Aug. 26, 2021 carrier | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |
Book value of assets pledged under ship mortgages | $ 1,817,000,000 | $ 1,864,000,000 |  |  |
Book value of assets with finance lease liabilities | 677,000,000 | 697,000,000 |  |  |
Restricted cash | 5,866,000 | $ 8,953,000 |  |  | $ 7,994,000
Other commitment, purchase price of vessel | $ 151,500,000 |  |  |  |
Number of container vessels acquired | vessel | 2 |  |  |  |
Subsequent Event |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of dual-fuel car carriers delivered | carrier |  |  | 2 |  |
Common stock - Frontline Ltd |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Investment owned, balance (in shares) | shares |  | 1.4 |  |  |
Principal debt amount | $ 15,600,000 | $ 15,600,000 |  |  | $ 36,800,000
Debt for acquired equipment |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Long-term Line of Credit | 1,700,000,000 | 1,700,000,000 |  |  |
Debt for acquired equipment | Equity Accounted Subsidiaries |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Long-term debt | 177,700,000 |  |  |  |
Frontline Forward Contract |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Investment Owned, at Fair Value | $ 13,000,000 | 9,000,000 |  |  |
Frontline Forward Contract | Common stock - Frontline Ltd |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Investment owned, balance (in shares) | shares | 1.4 |  |  |  |
Installation of scrubbers |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of container vessels with amended charter terms | $ 0 | $ 5,800,000 |  |  |
Number of vessels being upgraded | vessel |  | 9 |  |  |
Installation of BWTS |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of container vessels with amended charter terms | $ 6,100,000 | $ 7,000,000 |  |  |
Number of vessels being upgraded | vessel | 13 | 16 |  |  |
Container Vessel Acquisition |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of container vessels with amended charter terms | $ 31,700,000 |  |  |  |
Other commitment, purchase price of vessel | 36,000,000 |  |  |  |
Other commitment, deposit paid |  |  |  | $ 4,300,000 |
Two 14000 TEU Container Vessel Acquisition |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of container vessels with amended charter terms | $ 191,500,000 |  |  |  |
Number of container vessels acquired | vessel | 2 |  |  |  |
Dual-Fuel Car Carriers |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Number of container vessels with amended charter terms | $ 130,200,000 | $ 0 |  |  |
Property not subject to direct financing leases |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Book value of assets pledged under ship mortgages | 1,518,000,000 | 1,189,000,000 |  |  |
Property subject to direct financing leases |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Book value of assets pledged under ship mortgages | 299,000,000 | 675,000,000 |  |  |
Vessels under finance lease, net |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |
Book value of assets with finance lease liabilities | $ 677,000,000 | $ 697,000,000 |  |  |

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