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Fair Value of Financial Instruments - Variable Interest Entities - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
entity
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Disclosure of Liabilities Not Measured at Fair Value [Line Items]      
Consolidated assets $ 9,923,542 $ 8,975,275 $ 9,373,500
Liabilities 6,589,021 5,987,932  
Other long-term assets 503,483 447,235  
Reporting entity involvement, maximum loss exposure, amount $ 28,000 $ 34,000  
Electric Utility Company One      
Fair Value Disclosure of Liabilities Not Measured at Fair Value [Line Items]      
Variable interest entity, percent   49.00%  
Variable Interest Entity, Primary Beneficiary      
Fair Value Disclosure of Liabilities Not Measured at Fair Value [Line Items]      
Number of entities | entity 2    
Consolidated assets $ 187,300 $ 134,800  
Liabilities 184,600 132,800  
Variable Interest Entity, Not Primary Beneficiary      
Fair Value Disclosure of Liabilities Not Measured at Fair Value [Line Items]      
Other long-term assets $ 20,000 $ 23,000