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Pension Plans and Other Postretirement Benefits - Domestic and Foreign Pension and Postretirement Defined Benefit Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total net pension and postretirement benefits cost | $ 1,256 | $ 1,979 | $ 2,529 | $ 3,933
Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1,563 | 1,334 | 3,129 | 2,655
Interest cost | 8,140 | 8,558 | 16,285 | 17,100
Expected return on assets | (8,838) | (8,415) | (17,668) | (16,824)
Amortization of prior service benefit | 19 | 21 | 39 | 41
Total net pension and postretirement benefits cost | 884 | 1,498 | 1,785 | 2,972
Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 11 | 12 | 23 | 24
Interest cost | 361 | 469 | 721 | 937
Total net pension and postretirement benefits cost | $ 372 | $ 481 | $ 744 | $ 961

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