v3.26.1
Pension and Other Postretirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Plan Deferred Pension And Other Postretirement Benefit Plan Costs Recovered [Abstract]    
Deferred (recognized) pension and OPEB costs   $ (600)
Pension Benefits [Member]    
Components of net periodic benefit cost:    
Service cost $ 619 651
Interest cost 4,011 4,256
Expected return on assets (7,736) (7,261)
Amortization of:    
Actuarial (gain) loss 44 48
Net periodic benefit (credit) cost (3,062) (2,306)
Postretirement Benefits [Member]    
Components of net periodic benefit cost:    
Service cost 175 183
Interest cost 682 760
Expected return on assets (707) (724)
Amortization of:    
Transition obligation 0 1
Actuarial (gain) loss (181) (148)
Net periodic benefit (credit) cost $ (31) $ 72