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Employee Pension Plans (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Summary of Net Periodic Benefit Cost
The following table sets forth a summary of the net periodic benefit cost for the three and nine months ended September 30, 2021 and 2020:
Three Months Ended September 30,Nine Months Ended September 30,
(in thousands)2021202020212020
Interest cost$582 $758 $1,746 $2,273 
Service cost236 231 709 694 
Expected return on plan assets(1,015)(1,006)(3,045)(3,017)
Recognized net actuarial losses683 592 2,049 1,775 
Net periodic benefit cost$486 $575 $1,459 $1,725