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RELATED PARTY TRANSACTIONS - Additional Information (Details) | 1 Months Ended | 12 Months Ended |  |  |
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Oct. 31, 2019 | Jan. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) vessel | Dec. 31, 2019 USD ($) vessel | Dec. 31, 2018 USD ($) very_large_crude_carrier | Dec. 31, 2017 USD ($) suezmax_tanker | Dec. 31, 2017 USD ($) very_large_crude_carrier | Dec. 31, 2017 USD ($) | Aug. 31, 2019 USD ($) vessel | Jun. 30, 2016 USD ($) | Jan. 01, 2014 vessel
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of leased assets | vessel |  |  |  |  |  |  |  |  | 5 |  |
Promissory notes |  |  |  | $ 20,084,000 | $ 21,894,000 |  |  |  |  |  |
Contingent rental income |  |  |  | (2,607,000) | (19,738,000) |  |  | $ (26,148,000) |  |  |
Lease termination payment |  |  |  |  | (22,391,000) |  |  | (19,006,000) |  |  |
Profit share expense |  |  |  | 4,800,000 | $ 1,500,000 |  |  | 5,600,000 |  |  |
Payment Of Guarantee Fee |  |  |  | 3,400,000 |  |  |  |  |  |  |
$275.0 million revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  | 270,000,000.0 |  |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net |  |  |  | $ (66,000,000) |  |  |  |  |  |  |
SFL |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of leased assets | vessel |  |  |  | 3 |  |  |  |  |  |  |
Number of vessels whose lease was terminated |  |  | 3 |  | 6 | 2 | 2 |  |  |  |
Interest Expense, Related Party |  |  |  | $ 6,940,000 | $ 16,400,000 |  |  | 25,980,000 |  |  |
Contingent rental income |  |  |  | (2,607,000) | (19,738,000) |  |  | (26,148,000) |  |  |
Related party transactions, Charterhire Paid Including Principal and Interest |  |  |  | 11,745,000 | 47,324,000 |  |  | 75,055,000 |  |  |
Lease termination payment |  |  |  | 0 | (22,391,000) |  |  | (19,006,000) |  |  |
Contingent rental income, net |  |  |  | 2,200,000 | 19,700,000 |  |  | 26,100,000 |  |  |
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments |  |  |  | 87,930,000 | 99,784,000 | $ 299,016,000 | $ 299,016,000 | 299,016,000 |  |  |
Profit share expense |  |  |  | 4,800,000 | 1,500,000 |  |  | 5,600,000 |  |  |
Number of vessels from Frontline 2012 involved in pooling arrangement | vessel |  |  |  |  |  |  |  |  |  |  | 2
Number of Ship Finance vessels involved in pooling arrangement | vessel |  |  |  |  |  |  |  |  |  |  | 2
Pool earnings allocated on a net basis |  |  |  | 1,500,000 | 200,000 |  |  | $ 2,100,000 |  |  |
SFL | SFL Promissory Notes |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Promissory notes |  |  |  | 20,100,000 | 21,900,000 |  |  |  |  |  |
Interest Expense, Related Party |  |  |  | 1,600,000 | 900,000 |  |  |  |  |  |
Feen Marine Scrubbers Inc. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Due from Related Parties |  |  | $ 6,000,000 |  |  |  |  |  |  |  |
Increase (Decrease) in Notes Receivable, Related Parties |  | $ 3,000,000 |  |  |  |  |  |  |  |  |
Related Party Transaction, Purchases from Related Party |  |  |  |  | 26,000,000 |  |  |  |  |  |
Repayment of related party loan notes |  |  |  | 9,100,000 | 8,200,000 |  |  |  |  |  |
Other Affiliates Of Hemen |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Guarantee From Related Party |  |  |  |  |  |  |  |  | $ 547,000,000 |  |
Payment Of Guarantee Fee |  |  |  | 3,400,000 |  |  |  |  |  |  |
Other Affiliates Of Hemen | $275.0 million revolving credit facility |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest Expense, Related Party |  |  |  | 8,900,000 | $ 9,300,000 |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  |  | $ 275,000,000.0 |
Debt Instrument, Increase (Decrease), Net |  |  |  | 66,000,000 |  |  |  |  |  |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  |  | $ 155,000,000 |  |  |  |  |  |  |
Loan facility extended period | 6 months |  |  |  |  |  |  |  |  |  |

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