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Employee Retirement Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Employee Retirement Plans        
Service cost $ 97 $ 116 $ 193 $ 234
Interest cost 637 644 1,274 1,316
Expected return on plan assets (612) (574) (1,224) (1,151)
Net amortization and deferral 99 114 198 248
Pension expense $ 221 $ 300 $ 441 $ 647