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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2018
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,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (In thousands)
Pension Benefits |  |  |  |  |  |  |
Company-administered plans: |  |  |  |  |  |  |
Service cost | $ | 3,095 |  |  | 3,017 |  |  | $ | 6,296 |  |  | 6,266 |
Interest cost | 19,098 |  |  | 21,426 |  |  | 38,850 |  |  | 42,915 |
Expected return on plan assets | (25,065 | ) |  | (22,712 | ) |  | (50,899 | ) |  | (45,190 | )
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 6,914 |  |  | 8,077 |  |  | 14,286 |  |  | 16,527 |
Prior service cost | 144 |  |  | 121 |  |  | 289 |  |  | 266 |
| 4,186 |  |  | 9,929 |  |  | 8,822 |  |  | 20,784 |
Union-administered plans | 2,524 |  |  | 2,621 |  |  | 4,870 |  |  | 5,123 |
Net pension expense | $ | 6,710 |  |  | 12,550 |  |  | $ | 13,692 |  |  | 25,907 |
Company-administered plans: |  |  |  |  |  |  |
U.S. | $ | 6,665 |  |  | 10,547 |  |  | $ | 14,022 |  |  | 21,858 |
Non-U.S. | (2,479 | ) |  | (618 | ) |  | (5,200 | ) |  | (1,074 | )
| 4,186 |  |  | 9,929 |  |  | 8,822 |  |  | 20,784 |
Union-administered plans | 2,524 |  |  | 2,621 |  |  | 4,870 |  |  | 5,123 |
Net pension expense | $ | 6,710 |  |  | 12,550 |  |  | $ | 13,692 |  |  | 25,907 |
During the six months ended June 30, 2018, we contributed $19 million to our pension plans. In 2018, the expected total contributions to our pension plans are approximately $28 million. We also maintain other postretirement benefit plans that are not reflected in the above table. The amount of postretirement benefit expense was not material for the three and six months ended June 30, 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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