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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Employee Retirement Plans    
Service cost $ 96 $ 118
Interest cost 637 672
Expected return on plan assets (612) (577)
Net amortization and deferral 99 134
Pension expense $ 220 $ 347