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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 18, 2022
Aug. 25, 2022
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]            
Debt Instrument, Unamortized Discount       $ (7,615) $ (7,636)  
Debt Issuance Costs, Net       (21,092) (20,143)  
Long-Term Debt and Lease Obligation, Including Current Maturities       2,960,815 2,682,471  
Long-term Debt, Current Maturities       772,984 12  
Long-term Debt, excluding current maturities       $ 2,160,401 2,661,743  
Debt Instrument, Redemption Price, Percentage       100.00%    
Debt Instrument, Covenant Compliance, Default Provision, Indebtnedness Threshold       $ 100,000    
Debt Instrument, Covenant Compliance, Default Provision, Debt Holders       25.00%    
Kansas Gas Service Securitization I LLC            
Debt Instrument [Line Items]            
Debt Issuance Costs, Net       $ (5,300) (5,900)  
3.61% Senior Unsecured Notes Due 2024            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       3.61%    
Long-term Debt, Gross       $ 300,000 300,000  
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       $ 473,000 473,000  
Extinguishment of Debt, Amount $ 77,000 $ 150,000        
Debt Instrument, Face Amount           $ 700,000
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  
5.10% Senior Unsecured Notes Due 2029 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       5.10%    
Long-term Debt, Gross       $ 300,000 0  
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  
Debt Instrument, Face Amount       $ 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       2,673,000 2,373,000  
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       315,284 336,000  
Long-term Debt, Current Maturities       $ 27,430 20,716  
Debt Instrument, Face Amount $ 336,000          
Weighted Average Life of Securitized Bonds [Domain] 5 years 6 months          
Long-Term Debt, Term 10 years          
8.00% Other Long Term Debt            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       8.00%    
Long-term Debt, Gross       $ 1,238 $ 1,250  
0.85% Senior Unsecured Notes Due 2023 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage           0.85%
Extinguishment of Debt, Amount $ 250,000 $ 750,000        
Debt Instrument, Face Amount           $ 1,000,000
Floating rate senior unsecured notes due March 2023            
Debt Instrument [Line Items]            
Extinguishment of Debt, Amount     $ 400,000