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Employee Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Components of benefit expense
The components of the employee benefit plan expense consisted of the following:
 Three Months Ended 
June 30,
Six Months Ended 
June 30,
(in thousands)2021202020212020
Interest cost$4,103 $4,918 $8,206 $9,835 
Expected return on plan assets, net of expenses(5,820)(5,256)(11,640)(10,512)
Amortization of actuarial loss and prior service cost1,486 1,124 2,973 2,249 
Total for defined benefit pension plan(231)786 (461)1,572 
Multi-employer plans— 52 — 61 
SERPs224 240 447 480 
Defined contribution plan3,702 3,702 7,680 7,481 
Net periodic benefit cost3,695 4,780 7,666 9,594 
Allocated to discontinued operations— (121)— (326)
Net periodic benefit cost — continuing operations$3,695 $4,659 $7,666 $9,268