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Income Taxes - Schedule of Federal Statutory Rate Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]      
Income before income taxes $ 114,933 $ 102,937 $ 90,943
Amount      
Income tax at federal statutory rate 24,136 21,617 19,098
Increase (decrease) in taxes attributable to:      
State and local income taxes, net of federal income tax effect 1,326 6,488 6,001
Tax credits (208) 0 0
Nontaxable or nondeductible items 543 0 0
Changes in unrecognized tax benefits 331 (1,053) (4,330)
Property flow-through 0 (14,793) (9,045)
Pension flow-through 0 (530) (597)
Stock-based compensation 0 192 (491)
Flow-through (11,933) 0 0
Reversal of excess deferred taxes recognized in regulatory liability (1,517) (3,227) (3,625)
Other items (323) 276 (1,055)
Income tax expense $ 12,355 $ 8,970 $ 5,956
Percent      
Income tax at federal statutory rate 21.00%    
Increase (decrease) in taxes attributable to:      
State and local income taxes, net of federal income tax effect 1.20%    
Tax credits (0.20%)    
Nontaxable or nondeductible items 0.50%    
Changes in unrecognized tax benefits 0.30%    
Property flow-through 0.00%    
Pension flow-through 0.00%    
Stock-based compensation 0.00%    
Flow-through (10.40%)    
Reversal of excess deferred taxes recognized in regulatory liability (1.30%)    
Other items (0.30%)    
Effective income tax rate 10.80%