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Pension and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 112 $ 103 $ 323 $ 319
Interest cost 2,410 2,393 7,074 7,131
Expected return on plan assets (2,100) (2,056) (6,160) (6,104)
Actuarial loss (gain) amortization 154 128 443 380
Prior service cost amortization 6 6 18 21
Net periodic benefit cost (income) 582 574 1,698 1,747
Other Postretirement Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost 0 0 0 0
Interest cost 17 15 46 46
Expected return on plan assets 0 0 0 0
Actuarial loss (gain) amortization (18) (17) (70) (76)
Prior service cost amortization 0 0 0 0
Net periodic benefit cost (income) $ (1) $ (2) $ (24) $ (30)