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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Base Plans        
Net periodic benefit cost:        
Service cost $ 81 $ 82 $ 238 $ 247
Interest cost 64 58 187 175
Expected return on plan assets (65) (57) (192) (173)
Net periodic benefit cost 80 83 233 249
Performance Plans        
Net periodic benefit cost:        
Service cost 315 12 372 408
Interest cost 27 25 79 74
Expected return on plan assets (26) (27) (75) (71)
Net periodic benefit cost $ 316 $ 10 $ 376 $ 411