LONG-TERM DEBT (Tables)

12 Months Ended

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.