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EMPLOYEE BENEFIT PLANS
 9 Months Ended
Sep. 30, 2021
Retirement Benefits [Abstract]  
EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS
Components of net pension expense were as follows:
Three months ended September 30,Nine months ended September 30,
 2021202020212020
 (In thousands)
Company-administered plans:
Service cost$276 $2,967 $824 $8,921 
Interest cost14,496 17,463 43,514 52,348 
Expected return on plan assets(21,702)(24,304)(65,187)(72,515)
Curtailment loss— 6,303 — 6,303 
Amortization of net actuarial loss and prior service cost7,056 7,784 21,184 23,308 
126 10,213 335 18,365 
Multi-employer plans2,586 2,769 7,766 8,346 
Net pension expense$2,712 $12,982 $8,101 $26,711 
Company-administered plans:
U.S.$2,227 $12,215 $6,680 $25,048 
Non-U.S.(2,101)(2,002)(6,345)(6,683)
126 10,213 335 18,365 
Multi-employer plans2,586 2,769 7,766 8,346 
Net pension expense$2,712 $12,982 $8,101 $26,711 
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 nine months ended September 30, 2021, we contributed $5 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.