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Employee Pension Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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