Annual report [Section 13 and 15(d), not S-K Item 405]

Benefit Plans - Net Periodic Benefit Cost (Details)

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Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Pension Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Interest cost $ 3,227 $ 3,453 $ 2,569
Expected return on plan assets (3,367) (3,305) (3,433)
Amortization of prior service credit 0 0 0
Amortization of net (gain) loss 0 0 0
Settlement (gain) loss (6) 61 38
Net periodic (benefit) expense (146) 209 (826)
Other Postretirement Benefits Plans      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)      
Interest cost 24 24 18
Expected return on plan assets 0 0 0
Amortization of prior service credit (30) (125) (210)
Amortization of net (gain) loss (2) (2) 3
Settlement (gain) loss 0 0 0
Net periodic (benefit) expense $ (8) $ (103) $ (189)