v3.26.3
Pension and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 104 $ 112 $ 311 $ 323
Interest cost 2,268 2,410 6,829 7,074
Expected return on plan assets (2,150) (2,100) (6,470) (6,160)
Actuarial loss (gain) amortization 168 154 506 443
Prior service cost amortization 7 6 20 18
Net periodic benefit cost (income) 397 582 1,196 1,698
Other Postretirement Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 0 0 0 0
Interest cost 12 17 37 46
Expected return on plan assets 0 0 0 0
Actuarial loss (gain) amortization (19) (18) (59) (70)
Prior service cost amortization 0 0 0 0
Net periodic benefit cost (income) $ (7) $ (1) $ (22) $ (24)