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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Pension and SERPA Benefits: |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | $ 963 | $ 1,175 | $ 2,889 | $ 3,525
Interest cost | 20,501 | 20,118 | 61,505 | 60,355
Expected return on plan assets | (32,799) | (33,143) | (98,397) | (99,429)
Amortization of unrecognized: Prior service cost | 380 | 188 | 1,140 | 564
Amortization of unrecognized: Net (gain) loss | (174) | (163) | (522) | (489)
Special retirement benefit cost | 0 | 0 | 0 | 1,722
Net periodic benefit income | (11,129) | (11,825) | (33,385) | (33,752)
Postretirement Healthcare Benefits: |  |  |  |
Defined Benefit Plan Disclosure |  |  |  |
Service cost | 643 | 723 | 1,929 | 2,169
Interest cost | 2,618 | 2,694 | 7,854 | 8,082
Expected return on plan assets | (4,675) | (4,424) | (14,025) | (13,272)
Amortization of unrecognized: Prior service cost | 149 | 149 | 447 | 447
Amortization of unrecognized: Net (gain) loss | (1,369) | (1,250) | (4,107) | (3,750)
Net periodic benefit income | $ (2,634) | $ (2,108) | $ (7,902) | $ (6,324)

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