Quarterly report pursuant to Section 13 or 15(d)

Employee Benefit Plans - Net Periodic Benefit Income (Details)

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Employee Benefit Plans - Net Periodic Benefit Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Base Plans        
Net periodic benefit cost:        
Service cost $ 78 $ 84 $ 157 $ 165
Interest cost 61 60 123 117
Expected return on plan assets (63) (59) (127) (116)
Net periodic benefit cost 76 85 153 166
Performance Plans        
Net periodic benefit cost:        
Service cost 0 8 57 396
Interest cost 26 25 52 49
Expected return on plan assets (24) (22) (49) (44)
Net periodic benefit cost $ 2 $ 11 $ 60 $ 401