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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Components of net periodic benefit cost | 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 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans. + References No definition available. + Details
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