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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Components of benefit expense
The components of the employee benefit plan expense consisted of the following:
 Three Months Ended 
September 30,
Nine Months Ended 
September 30,
(in thousands)2021202020212020
Interest cost$4,143 $5,014 $12,349 $14,849 
Expected return on plan assets, net of expenses(5,786)(5,250)(17,426)(15,762)
Amortization of actuarial loss and prior service cost1,684 1,255 4,657 3,504 
Total for defined benefit pension plan41 1,019 (420)2,591 
Multi-employer plans— 15 — 76 
SERPs223 242 670 722 
Defined contribution plan3,197 3,060 10,877 10,541 
Net periodic benefit cost3,461 4,336 11,127 13,930 
Allocated to discontinued operations— (171)— (497)
Net periodic benefit cost — continuing operations$3,461 $4,165 $11,127 $13,433