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Pension Plans and Other Postretirement Benefit Plans - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]          
Payment for pension benefits       $ 6,666 $ 6,666
Percentage of service related net periodic benefit costs capitalized to utility property       40.00%  
Percentage of service related net periodic benefit costs recorded to operating expenses       60.00%  
Percentage of non-service related net periodic benefit costs capitalized to regulatory assets       40.00%  
Percentage of non-service related net periodic benefit costs recorded to other expense       60.00%  
Curtailment associated gain $ 1,400        
Pension Plans, Defined Benefit [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Expected contributions to pension plan   $ 10,000   $ 10,000  
Curtailment associated gain   (169)   (169)  
Loss on acceleration of unrecognized priof service costs   $ 126 $ 123 $ 249 $ 246