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SHORT-TERM AND LONG-TERM DEBT - Narrative (Details) kr in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2023 USD ($) | Feb. 28, 2023 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 NOK (kr) | Sep. 30, 2024 NOK (kr) | Apr. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 NOK (kr) | May 12, 2021 USD ($) | Jan. 21, 2020 NOK (kr) | Jun. 04, 2019 NOK (kr)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 2,862,240,000 |  |  |  | $ 2,163,688,000 |  |  |  |
Total assets |  |  | 4,107,769,000 |  |  |  | 3,731,389,000 |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  | 3,500,000,000 |  |  |  | 2,600,000,000 |  |  |  |
$60 Million Loan Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  |  | 60,000,000 |  |  |  |  |  |  |  |
Long-term debt |  |  | 15,000,000.0 |  |  |  | 60,000,000.0 |  |  |  |
NOK700 million senior unsecured bonds due 2024 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  |  | 700,000,000 |  |  |  |  |  |  |  | kr 700.0
Facility repurchased amount |  |  | 62,800,000 | kr 695.0 |  |  |  |  |  |  |
Gain (loss) on purchased bonds |  |  | (400,000) |  |  |  |  |  |  |  |
Long-term debt |  |  | 0 | 0.0 |  |  | 68,400,000 | kr 695.0 |  |  |
NOK 600 Million Senior Unsecured Bond Due 2025 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount | kr |  |  |  |  |  |  |  |  |  | kr 600.0 |
Facility repurchased amount |  |  | 56,100,000 | 590.0 |  |  |  |  |  |  |
Gain (loss) on purchased bonds |  |  | (400,000) |  |  |  |  |  |  |  |
Long-term debt |  |  | $ 0 | kr 0.0 |  |  | 58,100,000 | 590.0 |  |  |
7.25% senior unsecured sustainability-linked bonds due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  |  |  |  |  |  |  |  | $ 150,000,000 |  |
Interest rate (as a percent) |  |  | 7.25% | 7.25% |  |  |  |  | 7.25% |  |
Long-term debt |  |  | $ 150,000,000 |  |  |  | 150,000,000 |  |  |  |
8.875% senior unsecured sustainability-linked bonds due 2027 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  | $ 150,000,000.0 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 8.875% | 8.875% | 8.875% |  |  |  |  |  |  |
Long-term debt |  |  | $ 150,000,000 |  |  |  | 150,000,000 |  |  |  |
Issue price, percentage (as a percent) |  | 0.9958 |  |  |  |  |  |  |  |  |
Unamortized discount |  | $ 600,000 |  |  |  |  |  |  |  |  |
US Dollar 150 million senior secured term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount | $ 150,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 147,400,000 |  |  |  | 148,900,000 |  |  |  |
Term of loan in years | 3 years |  |  |  |  |  |  |  |  |  |
Senior Unsecured Bonds Due 2028 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 8.25% |  |  |  |  |
Long-term debt |  |  | 145,200,000 |  |  |  | 0 |  |  |  |
Carbon Emissions Reduction Rate |  |  |  |  |  | 0.02 |  |  |  |  |
Unsecured sustainability linked bonds, principal amounts |  |  | 10,800,000 |  |  |  |  |  |  |  |
Unsecured sustainability linked bonds, loss on transaction |  |  | 500,000 |  |  |  |  |  |  |  |
Resold unsecured sustainability linked bonds, principal amounts |  |  | 6,000,000.0 |  |  |  |  |  |  |  |
NOK750 million senior unsecured floating rate bonds due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate debt amount |  |  | 750,000,000 |  | kr 750.0 |  |  |  |  |  |
Facility repurchased amount |  |  | 2,400,000 | kr 26.0 |  |  |  |  |  |  |
Long-term debt |  |  | $ 63,600,000 | kr 724.0 |  |  | $ 0 | kr 0.0 |  |  |

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