XML 74 R60.htm IDEA: XBRL DOCUMENT v3.24.0.1
Employee Benefit Plans, Components of Net Periodic Benefit Cost (Details) - Defined Benefit Pension Plans Combined [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Components of Net Periodic Pension Cost [Abstract]    
Service cost $ 598 $ 1,025
Interest cost 1,876 1,336
Expected return on plan assets (3,612) (4,218)
Amortization of prior service credit (13) (13)
Rate-regulated adjustment 2,831 4,170
Net periodic benefit cost 1,680 $ 2,300
Change in defined benefit plan regulatory asset from pension contribution greater (less) than net periodic benefit cost 2,831  
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)