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Pension Plans - Components of Net Periodic Pension Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Retirement Benefits [Abstract] |  |  |  |
Service cost | $ 3,641 | $ 4,760 | $ 11,166 | $ 15,266
Interest cost | 1,552 | 1,131 | 4,713 | 3,593
Expected return on plan assets | (1,276) | (1,339) | (3,865) | (4,260)
Recognized actuarial (gain) loss | (101) | 13 | (304) | 39
Net periodic pension cost | $ 3,816 | $ 4,565 | $ 11,710 | $ 14,638

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