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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, 2022
Dec. 31, 2021
Components of Net Periodic Pension Cost [Abstract]    
Service cost $ 1,025 $ 1,086
Interest cost 1,336 1,209
Expected return on plan assets (4,218) (3,651)
Amortization of loss 0 483
Amortization of prior service credit (13) (13)
Rate-regulated adjustment 4,170 3,186
Net periodic benefit cost 2,300 $ 2,300
Change in defined benefit plan regulatory asset from pension contribution greater (less) than net periodic benefit cost 4,170  
Amortization of Regulatory Assets to be Reclassified into Net Periodic Benefit Cost [Abstract]    
Net loss 0  
Net prior service credit (13)  
Total amortization of regulatory assets to be reclassified into net periodic benefit cost during the next fiscal year $ (13)