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Employee Pension Plans (Summary of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Summary of net periodic benefit cost |  |  |  |
Interest cost | $ 910 | $ 969 | $ 1,821 | $ 1,938
Service cost | 232 | 255 | 463 | 510
Expected return on plan assets | (944) | (979) | (1,888) | (1,957)
Recognized net actuarial losses | 438 | 413 | 875 | 826
Net periodic benefit cost | $ 636 | $ 658 | $ 1,271 | $ 1,317

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