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LONG-TERM DEBT (Tables) | 12 Months Ended
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Dec. 31, 2023
Long-Term Debt, Unclassified [Abstract] |
Schedule of Long-Term Debt Instruments | The table below presents a summary of our long-term debt outstanding for the periods indicated:
|  | Interest rate at December 31, 2023 | December 31, 2023 | December 31, 2022
|  |  | (Thousands of dollars)
Senior Notes due: |  |  |  |
February 2024 |  | 3.610% | $ | 300,000 |  | $ | 300,000 |
March 2024 |  | 1.100% | 473,000 |  | 473,000 |
April 2029 |  | 5.100% | 300,000 |  | — |
May 2030 |  | 2.000% | 300,000 |  | 300,000 |
September 2032 |  | 4.250% | 300,000 |  | 300,000 |
February 2044 |  | 4.658% | 600,000 |  | 600,000 |
November 2048 |  | 4.500% | 400,000 |  | 400,000 |
Total Senior Notes |  |  | 2,673,000 |  | 2,373,000 |
KGSS-I Securitized Utility Tariff Bonds |  | 5.486% | 315,284 |  | 336,000 |
Other |  | 8.000% | 1,238 |  | 1,250 |
Unamortized discounts on long-term debt |  |  | (7,615) |  | (7,636) |
Debt issuance costs (a) |  |  | (21,092) |  | (20,143) |
Total long-term debt, net |  |  | 2,960,815 |  | 2,682,471 |
Less: current maturities of securitized utility tariff bonds, net |  |  | 27,430 |  | 20,716 |
Less: current maturities of other long-term debt, net |  |  | 772,984 |  | 12 |
Noncurrent portion of long-term debt, net |  |  | $ | 2,160,401 |  | $ | 2,661,743 |
(a) Includes issuance costs for the KGSS-I Securitized Utility Tariff Bonds of $5.3 million and $5.9 million, respectively.

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