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Employee Benefit Plans
 9 Months Ended
Sep. 30, 2022
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)2022202120222021
Interest cost$4,333 $4,143 $12,999 $12,349 
Expected return on plan assets, net of expenses(6,227)(5,786)(18,675)(17,426)
Amortization of actuarial loss and prior service cost997 1,684 3,026 4,657 
Total for defined benefit pension plan(897)41 (2,650)(420)
SERPs214 223 642 670 
Defined contribution plan3,258 3,197 11,582 10,877 
Net periodic benefit cost$2,575 $3,461 $9,574 $11,127 

We contributed $0.8 million to fund current benefit payments for our SERPs and provided a $25 million discretionary contribution to our defined benefit pension plan during the nine months ended September 30, 2022. During the remainder of 2022, we anticipate contributing an additional $1.1 million to fund the SERPs' benefit payments and do not expect any additional contributions to our defined pension plan.