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SHORT-TERM AND LONG-TERM DEBT - Schedule of Long-Term Debt (Details) kr in Millions | Dec. 31, 2024 USD ($) | Dec. 31, 2024 NOK (kr) | Sep. 30, 2024 NOK (kr) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 NOK (kr) | Feb. 28, 2023 USD ($) | May 12, 2021 USD ($) | Jun. 04, 2019 NOK (kr)
--- | --- | --- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total debt principal | $ 2,862,240,000 |  |  | $ 2,163,688,000 |  |  |  |
Less: unamortized debt issuance costs | (22,778,000) |  |  | (16,942,000) |  |  |  |
Less: current portion of long-term debt | (689,045,000) |  |  | (432,918,000) |  |  |  |
Long-term debt | 2,150,417,000 |  |  | 1,713,828,000 |  |  |  |
NOK700 million senior unsecured floating rate bonds due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate debt amount | 700,000,000 |  |  |  |  |  |  | kr 700.0
Long-term debt, gross | 0 |  |  | 68,426,000 |  |  |  |
Total debt principal | 0 | kr 0.0 |  | 68,400,000 | kr 695.0 |  |  |
NOK600 million senior unsecured floating rate bonds due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate debt amount | 600,000,000 |  |  |  |  |  |  |
Long-term debt, gross | $ 0 |  |  | 58,089,000 |  |  |  |
7.25% senior unsecured sustainability-linked bonds due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (in percentage) | 7.25% | 7.25% |  |  |  |  | 7.25% |
Aggregate debt amount |  |  |  |  |  |  | $ 150,000,000 |
Long-term debt, gross | $ 150,000,000 |  |  | 150,000,000 |  |  |  |
Total debt principal | 150,000,000 |  |  | 150,000,000 |  |  |  |
U.S. dollar denominated fixed rate debt due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | $ 147,375,000 |  |  | 148,875,000 |  |  |  |
8.875% senior unsecured sustainability-linked bonds due 2027 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (in percentage) | 8.875% | 8.875% |  |  |  | 8.875% |  |
Aggregate debt amount |  |  |  |  |  | $ 150,000,000.0 |  |
Long-term debt, gross | $ 150,000,000 |  |  | 150,000,000 |  |  |  |
Total debt principal | $ 150,000,000 |  |  | 150,000,000 |  |  |  |
8.25% senior unsecured sustainability-linked bonds due 2028 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (in percentage) | 8.25% | 8.25% |  |  |  |  |  |
Long-term debt, gross | $ 145,200,000 |  |  | 0 |  |  |  |
NOK750 million senior unsecured floating rate bonds due 2029 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Aggregate debt amount | 750,000,000 |  | kr 750.0 |  |  |  |  |
Long-term debt, gross | 63,592,000 |  |  | 0 |  |  |  |
Total debt principal | 63,600,000 | kr 724.0 |  | 0 | kr 0.0 |  |  |
Lease debt financing due through 2033 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | 702,164,000 |  |  | 573,456,000 |  |  |  |
U.S. dollar denominated floating rate debt due through 2030 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | 1,503,909,000 |  |  | 1,014,842,000 |  |  |  |
Total debt principal | $ 1,503,900,000 |  |  | $ 1,014,800,000 |  |  |  |

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