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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
Employee Benefit Plans Employee Benefit Plans
We sponsor a noncontributory defined benefit pension plan and non-qualified Supplemental Executive Retirement Plans ("SERPs"). The accrual for future benefits has been frozen in our defined benefit pension plan and SERPs.

We sponsor a defined contribution plan covering substantially all non-union and certain union employees. We match a portion of employees' voluntary contributions to this plan.
Other union-represented employees are covered by defined benefit pension plans jointly sponsored by us and the union, or by union-sponsored multi-employer plans.
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 
We contributed $0.8 million to fund current benefit payments for our SERPs and $24.1 million for our defined benefit pension plan during the nine months ended September 30, 2021. During the remainder of 2021, we anticipate contributing an additional $0.6 million to fund the SERPs' benefit payments. As of September 30, 2021, we have met our 2021 funding requirements under the provisions of the Pension Funding Equity Act of 2004 and the Pension Protection Act of 2006. We do not expect to make any contributions to our defined pension plan the remainder of the year.