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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Summary of Components of Net Periodic Benefit Income for the Pension Plans
Net periodic benefit income from our pension plans included the following components for our pension benefits:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2024202320242023
Service cost$1,718 $1,504 $5,156 $4,501 
Interest cost25,335 26,141 76,024 78,394 
Expected return on plan assets(44,352)(41,270)(133,095)(123,773)
Amortization of prior service cost281 173 843 519 
Amortization of actuarial loss3,564 2,340 10,698 7,021 
Net periodic benefit income$(13,454)$(11,112)$(40,374)$(33,338)