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Debt Instrument, Covenant Compliance, Default Provision - Threshold of percentage held, of the aggregate principal amount of outstanding Senior Notes, to declare acceleration of repayment upon an event of default.

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Indebtedness threshold considered an event of default as stipulated in our Senior Note indenture.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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LONG-TERM DEBT (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-Term Debt		$ 2,414,256	$ 2,960,815
Debt Instrument, Unamortized Discount		(3,624)	(7,615)
Debt Issuance Costs, Net		(20,691)	(21,092)
Long-term Debt, Current Maturities		14	772,984
Long-term Debt, excluding current maturities		2,385,286	2,160,401
Debt Instrument, Covenant Compliance, Default Provision, Indebtnedness Threshold		$ 100,000
Debt Instrument, Covenant Compliance, Default Provision, Debt Holders		25.00%
Debt Instrument, Redemption Price, Percentage		100.00%
Kansas Gas Service Securitization I LLC
Debt Instrument [Line Items]
Debt Issuance Costs, Net		$ (4,800)	(5,300)
3.61% Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	3.61%	3.61%
Long-term Debt, Gross		$ 0	300,000
Repayments of Debt	$ 300,000
1.10% Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	1.10%	1.10%
Long-term Debt, Gross		$ 0	473,000
Repayments of Debt	$ 473,000
5.10% Senior Unsecured Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.10%
Long-term Debt, Gross		$ 550,000	300,000
Additional Long-term Debt, Gross		$ 250,000
2.00% Senior Unsecured Notes Due 2024
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		2.00%
Long-term Debt, Gross		$ 300,000	300,000
4.25% Senior Unsecured Notes Due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.25%
Long-term Debt, Gross		$ 300,000	300,000
4.658% Senior Unsecured Notes Due 2044
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.658%
Long-term Debt, Gross		$ 600,000	600,000
4.50% Senior Unsecured Notes Due 2048
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		4.50%
Long-term Debt, Gross		$ 400,000	400,000
Total Senior Unsecured Notes
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 2,150,000	2,673,000
5.486% KGSS-I Securitized Utility Tariff Bonds Due 2032
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		5.486%
Long-term Debt, Gross		$ 287,345	315,284
Long-term Debt, Current Maturities		$ 28,956	27,430
8.00% Other Long Term Debt
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage		8.00%
Long-term Debt, Gross		$ 1,226	$ 1,238