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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2021
Retirement Benefits [Abstract]  
Components of benefit expense
The components of the employee benefit plan expense consisted of the following:
 Three Months Ended 
March 31,
(in thousands)20212020
Interest cost$4,103 $4,917 
Expected return on plan assets, net of expenses(5,820)(5,256)
Amortization of actuarial loss and prior service cost1,487 1,125 
Total for defined benefit pension plan(230)786 
Multi-employer plans— 
SERPs223 240 
Defined contribution plan3,978 3,779 
Net periodic benefit cost3,971 4,814 
Allocated to discontinued operations— (205)
Net periodic benefit cost — continuing operations$3,971 $4,609