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v3.21.2

OPERATING LEASES - Rental Income (Details) | 6 Months Ended |
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Jun. 30, 2021 USD ($) suezmax_tanker_vessel_type | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 large_range_2Tanker_vessel_type | Dec. 31, 2020 very_large_crude_carrier
Lessor, Lease, Description [Line Items] |  |  |  |  |
Vessels on fixed rate time charter |  |  |  | 1 | 2
Trafigura |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Time charter revenue, profit sharing | $ 0 | $ 6,300,000 |  |  |
Assets Under Sale and Purchase Agreement | Trafigura |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Duration of time charter | 3 years |  |  |  |
Time charter, daily rate, revenue | $ 28,400 |  |  |  |
Percentage of third party charter revenues to be received as profit share income | 50.00% |  |  |  |
Assets Under Sale and Purchase Agreement | Vessels Chartered To Trafigura |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Number of vessels chartered out | suezmax_tanker_vessel_type | 5 |  |  |  |
Assets Under Sale and Purchase Agreement | Vessels Chartered To Trafigura | Trafigura |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Vessels on fixed rate time charter | suezmax_tanker_vessel_type | 5 |  |  |  |
Assets leased to others |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |
Vessels, gross | $ 328,000,000 |  | $ 509,500,000 |  |
Accumulated depreciation | $ 15,100,000 |  | $ 49,400,000 |  |

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