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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2020
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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
| (In thousands) |  |  |  |  |  |
Pension Benefits |  |  |  |  |  |  |
Company-administered plans: |  |  |  |  |  |  |
Service cost | $ | 2,741 |  |  | $ | 2,783 |  |  | $ | 5,954 |  |  | $ | 5,815 |
Interest cost | 17,353 |  |  | 21,395 |  |  | 34,885 |  |  | 42,864 |
Expected return on plan assets | (23,948) |  |  | (22,589) |  |  | (48,211) |  |  | (45,265) |
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 7,437 |  |  | 7,432 |  |  | 15,152 |  |  | 15,042 |
Prior service cost | 185 |  |  | 187 |  |  | 372 |  |  | 366 |
| 3,768 |  |  | 9,208 |  |  | 8,152 |  |  | 18,822 |
Union-administered plans | 2,798 |  |  | 2,701 |  |  | 5,577 |  |  | 5,158 |
Net pension expense | $ | 6,566 |  |  | $ | 11,909 |  |  | $ | 13,729 |  |  | $ | 23,980 |
Company-administered plans: |  |  |  |  |  |  |
U.S. | $ | 6,055 |  |  | $ | 10,659 |  |  | $ | 12,833 |  |  | $ | 22,132 |
Non-U.S. | (2,287) |  |  | (1,451) |  |  | (4,681) |  |  | (3,310) |
| 3,768 |  |  | 9,208 |  |  | 8,152 |  |  | 18,822 |
Union-administered plans | 2,798 |  |  | 2,701 |  |  | 5,577 |  |  | 5,158 |
Net pension expense | $ | 6,566 |  |  | $ | 11,909 |  |  | $ | 13,729 |  |  | $ | 23,980 |
Non-operating pension costs 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, 2020, we contributed $17 million to our pension plans. In 2020, the expected total contributions to our pension plans are approximately $37 million. We also maintain other postretirement benefit plans that are not reflected in the table above. The amount of postretirement benefit expense was not material for the six months ended June 30, 2020 and 2019.

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