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Pensions and Other Postretirement Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs
The composition of the net periodic benefit cost/(income) for the nine months ended September 30, 2024 and 2023, was as follows:
Pension plans
Other postretirement benefits
(in thousands)
2024202320242023
Components of net periodic benefit cost/(income):
Service cost
$1,473 $986 $35 $45 
Interest cost4,545 3,447 1,063 1,405 
Expected return on assets
(4,030)(3,063) — 
Amortization of prior service cost/(income)(20)(24)(93)(3,068)
Amortization of net actuarial loss
556 421 (26)621 
Net periodic benefit cost/(credit)
$2,524 $1,767 $979 $(997)