v3.26.1
VARIABLE INTEREST ENTITES (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]          
Restricted cash and cash equivalents $ 22,711   $ 22,711   $ 23,107
Accounts receivable, net 250,861   250,861   461,631
Assets 8,812,203   8,812,203   8,853,084
Current maturities of securitized utility tariff bonds, net of issuance costs 31,404   31,404   30,566
Accounts payable 110,952   110,952   222,102
Paid-in capital 2,539,068   2,539,068   2,530,137
Liabilities and Equity 8,812,203   8,812,203   8,853,084
Utilities Operating Expense 238,681 $ 233,944 487,224 $ 476,173  
Kansas Gas Service Securitization I LLC          
Variable Interest Entity [Line Items]          
Restricted cash and cash equivalents 22,711   22,711   23,107
Accounts receivable, net 4,317   4,317   4,463
Finite-Lived Intangible Assets, Net 218,991   218,991   233,786
Assets 246,019   246,019   261,356
Current maturities of securitized utility tariff bonds, net of issuance costs 31,404   31,404   30,566
Accounts payable 217   217   136
Interest Payable 5,543   5,543   5,894
Securitized utility tariff bonds 207,115   207,115   223,020
Paid-in capital 1,680   1,680   1,680
Retained Earnings, Unappropriated 60   60   60
Liabilities and Equity 246,019   246,019   $ 261,356
Revenues 10,876 13,205 21,853 24,842  
Utilities Operating Expense (110) (111) (221) (221)  
Depreciation and amortization (7,368) (9,292) (14,795) (16,986)  
Interest Income 109 112 246 260  
Interest Expense (3,471) (3,879) (7,011) (7,823)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 36 35 72 72  
Variable Interest Entity, Measure of Activity, Income Tax 0 (6) 0 0  
Variable Interest Entity, Measure of Activity, Net Income $ 36 $ 29 $ 72 $ 72