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Employee Benefit Plans, Components of Net Periodic Benefit Cost (Details) - Defined Benefit Pension Plans Combined [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Components of Net Periodic Pension Cost [Abstract]    
Service cost $ 635 $ 598
Interest cost 1,855 1,876
Expected return on plan assets (3,164) (3,612)
Amortization of prior service credit (13) (13)
Rate-regulated adjustment 798 2,831
Net periodic pension cost 111 $ 1,680
Change in defined benefit plan regulatory asset from pension contribution greater (less) than net periodic benefit cost (798)  
Amortization of Regulatory Assets to be Reclassified into Net Periodic Benefit Cost [Abstract]    
Net loss 0  
Net prior service credit (11)  
Total amortization of regulatory assets to be reclassified into net periodic benefit cost during the next fiscal year $ (11)