v3.26.1
VARIABLE INTEREST ENTITES (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Variable Interest Entity [Line Items]      
Restricted cash and cash equivalents $ 11,639   $ 23,107
Accounts receivable, net 405,157   461,631
Assets 8,825,601   8,853,084
Current maturities of securitized utility tariff bonds, net of issuance costs 31,404   30,566
Accounts payable 137,587   222,102
Paid-in capital 2,530,435   2,530,137
Liabilities and Equity 8,825,601   8,853,084
Kansas Gas Service Securitization I LLC      
Variable Interest Entity [Line Items]      
Restricted cash and cash equivalents 11,639   23,107
Accounts receivable, net 4,403   4,463
Finite-Lived Intangible Assets, Net 226,359   233,786
Assets 242,401   261,356
Current maturities of securitized utility tariff bonds, net of issuance costs 31,404   30,566
Accounts payable 106   136
Interest Payable 2,217   5,894
Securitized utility tariff bonds 206,970   223,020
Discounts and issuance costs for securitized utility tariff bonds, excluding current maturities 4,100   4,300
Paid-in capital 1,680   1,680
Retained Earnings, Unappropriated 24   60
Liabilities and Equity 242,401   $ 261,356
Revenues 10,977 $ 11,637  
Utilities Operating Expense (111) (110)  
Depreciation and amortization (7,427) (7,694)  
Interest Income 137 148  
Interest Expense (3,540) (3,944)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 36 37  
Variable Interest Entity, Measure of Activity, Income Tax 0 6  
Variable Interest Entity, Measure of Activity, Net Income $ 36 $ 43