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Employee Benefit Plans
 6 Months Ended
Jun. 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 
June 30,		Six Months Ended 
June 30,
(in thousands)2022202120222021
Interest cost$4,333 $4,103 $8,666 $8,206 
Expected return on plan assets, net of expenses(6,224)(5,820)(12,448)(11,640)
Amortization of actuarial loss and prior service cost1,015 1,486 2,029 2,973 
Total for defined benefit pension plan(876)(231)(1,753)(461)
SERPs214 224 428 447 
Defined contribution plan3,871 3,702 8,324 7,680 
Net periodic benefit cost$3,209 $3,695 $6,999 $7,666 
We contributed $0.5 million to fund current benefit payments for our SERPs during the six months ended June 30, 2022. During the remainder of 2022, we anticipate contributing an additional $1.3 million to fund the SERPs' benefit payments. We have met our 2022 funding requirements under the provisions of the Pension Funding Equity Act of 2004 and the Pension Protection Act of 2006.