Quarterly report pursuant to Section 13 or 15(d)

Benefit Plans - (Details)

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Benefit Plans - (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Defined Benefit Pension Plans    
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Interest cost $ 808 $ 871
Expected return on plan assets (827) (837)
Net periodic (benefit) expense (19) 34
Other Postretirement Benefits Plan    
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Interest cost 6 6
Amortization of prior service credit (7) (31)
Amortization of net gain (1) (1)
Net periodic (benefit) expense $ (2) $ (26)