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
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Pension Plans    
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Interest cost $ 604 $ 551
Expected return on plan assets (1,110) (1,094)
Net periodic benefit (506) (543)
Other Postretirement Benefits Plans    
Defined Benefit Plan, Net Periodic Expense (Benefit)    
Interest cost 4 4
Amortization of prior service credit (53) (58)
Amortization of net loss 1 1
Net periodic benefit $ (48) $ (53)