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Accounting For Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Federal income taxes at statutory rates $ 28,977 $ 33,467 $ 28,673    
Tax effect of regulatory treatment of utility plant differences (12,366) (13,820) (12,893)    
State income tax expense 1,676 1,385 814    
Flow through related to deduction of meters and mixed service costs (34,454) (8,678)      
Non-plant excess deferred turnaround     (8,476)    
Customer refunds related to prior years at 35 percent     (1,189)    
Other (1,024) (323) 122    
Total income tax expense (benefit) $ 17,191 $ (12,031) $ (7,051)    
Federal statutory tax rate 21.00% 21.00% 21.00% 21.00% 35.00%
Tax effect of regulatory treatment of utility plant differences (9.00%) (8.70%) (9.40%)    
State income tax expense 1.20% 0.80% 0.60%    
Flow through related to deduction of meters and mixed service costs (25.00%) (5.40%)      
Non-plant excess deferred turnaround     (6.20%)    
Customer refunds related to prior years at 35 percent     (0.90%)    
Other (0.70%) (0.20%) 0.10%    
Effective Income Tax Rate Reconciliation, Percent (12.50%) 7.50% 5.20%