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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Pension Plans        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost $ 604 $ 551 $ 1,207 $ 1,102
Expected return on plan assets (1,110) (1,094) (2,219) (2,187)
Net periodic benefit (506) (543) (1,012) (1,085)
Other Postretirement Benefits Plans        
Defined Benefit Plan, Net Periodic Expense (Benefit)        
Interest cost 5 4 9 8
Amortization of prior service credit (53) (58) (105) (116)
Amortization of net loss 1 2 2 3
Net periodic benefit $ (47) $ (52) $ (94) $ (105)