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Employee Pension Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Summary of net periodic benefit cost    
Interest cost $ 933 $ 911
Service cost 170 231
Expected return on plan assets (902) (944)
Recognized net actuarial losses 414 437
Net periodic benefit cost $ 615 $ 635