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EMPLOYEE BENEFIT PLANS | 3 Months Ended
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Mar. 31, 2021
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Components of net pension expense were as follows:
| Three months ended March 31,
| 2021 |  | 2020
| (In thousands)
Company-administered plans: |  |  |
Service cost | $ | 368 |  |  | $ | 3,213 |
Interest cost | 14,535 |  |  | 17,532 |
Expected return on plan assets | (21,694) |  |  | (24,263) |
Amortization of net actuarial loss and prior service cost | 7,097 |  |  | 7,902 |
| 306 |  |  | 4,384 |
Multi-employer plans | 2,641 |  |  | 2,779 |
Net pension expense | $ | 2,947 |  |  | $ | 7,163 |
Company-administered plans: |  |  |
U.S. | $ | 2,363 |  |  | $ | 6,778 |
Non-U.S. | (2,057) |  |  | (2,394) |
| 306 |  |  | 4,384 |
Multi-employer plans | 2,641 |  |  | 2,779 |
Net pension expense | $ | 2,947 |  |  | $ | 7,163 |
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 three months ended March 31, 2021, we contributed $1 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.

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