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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Components of net pension expense were as follows:
Three months ended June 30,Six months ended June 30,
 2021202020212020
 (In thousands)
Company-administered plans:
Service cost$180 $2,741 $548 $5,954 
Interest cost14,483 17,353 29,018 34,885 
Expected return on plan assets(21,791)(23,948)(43,485)(48,211)
Amortization of net actuarial loss and prior service cost7,031 7,622 14,128 15,524 
(97)3,768 209 8,152 
Multi-employer plans2,539 2,798 5,180 5,577 
Net pension expense$2,442 $6,566 $5,389 $13,729 
Company-administered plans:
U.S.$2,090 $6,055 $4,453 $12,833 
Non-U.S.(2,187)(2,287)(4,244)(4,681)
(97)3,768 209 8,152 
Multi-employer plans2,539 2,798 5,180 5,577 
Net pension expense$2,442 $6,566 $5,389 $13,729 
Non-operating pension costs, net include the amortization of net actuarial loss and prior service cost, interest cost and expected return on plan assets components of pension and postretirement benefit costs, as well as any significant charges for settlements or curtailments if recognized. During the six months ended June 30, 2021, we contributed $2 million to our pension plans. In 2021, the expected total contributions to our pension plans are approximately $7 million. We also maintain other postretirement benefit plans that are not reflected in the table above as the amount of postretirement benefit expense for such plans was not material for any period presented.