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Employee Pension Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Summary of net periodic benefit cost        
Interest cost $ 911 $ 968 $ 2,732 $ 2,906
Service cost 231 255 694 765
Expected return on plan assets (943) (978) (2,831) (2,935)
Recognized net actuarial losses 437 413 1,312 1,239
Net periodic benefit cost $ 636 $ 658 $ 1,907 $ 1,975