Quarterly report pursuant to Section 13 or 15(d)

Net Periodic Pension Expense Benefit (Details)

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Net Periodic Pension Expense Benefit (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Pension Plans        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost $ 871 $ 604 $ 1,742 $ 1,207
Expected return on plan assets (837) (1,110) (1,674) (2,219)
Settlement loss 29 0 29 0
Net periodic expense (benefit) 63 (506) 97 (1,012)
Other Postretirement Benefits Plan        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost 6 5 12 9
Amortization of prior service credit (31) (53) (62) (105)
Amortization of net (gain) loss 0 1 (1) 2
Net periodic expense (benefit) $ (25) $ (47) $ (51) $ (94)