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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2017
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,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (In thousands)
Pension Benefits |  |  |  |  |  |  |
Company-administered plans: |  |  |  |  |  |  |
Service cost | $ | 3,017 |  |  | 3,005 |  |  | $ | 6,266 |  |  | 6,405 |
Interest cost | 21,426 |  |  | 27,093 |  |  | 42,915 |  |  | 49,332 |
Expected return on plan assets | (22,712 | ) |  | (22,667 | ) |  | (45,190 | ) |  | (45,752 | )
Amortization of: |  |  |  |  |  |  |
Net actuarial loss | 8,077 |  |  | 8,600 |  |  | 16,527 |  |  | 16,565 |
Prior service cost | 121 |  |  | 2,740 |  |  | 266 |  |  | 2,740 |
| 9,929 |  |  | 18,771 |  |  | 20,784 |  |  | 29,290 |
Union-administered plans | 2,621 |  |  | 2,406 |  |  | 5,123 |  |  | 4,728 |
Net pension expense | $ | 12,550 |  |  | 21,177 |  |  | $ | 25,907 |  |  | 34,018 |
Company-administered plans: |  |  |  |  |  |  |
U.S. | $ | 10,547 |  |  | 19,263 |  |  | $ | 21,858 |  |  | 30,437 |
Non-U.S. | (618 | ) |  | (492 | ) |  | (1,074 | ) |  | (1,147 | )
| 9,929 |  |  | 18,771 |  |  | 20,784 |  |  | 29,290 |
Union-administered plans | 2,621 |  |  | 2,406 |  |  | 5,123 |  |  | 4,728 |
Net pension expense | $ | 12,550 |  |  | 21,177 |  |  | $ | 25,907 |  |  | 34,018 |
During the six months ended June 30, 2017, we contributed $7.2 million to our pension plans. In 2017, the expected total contributions to our pension plans are approximately $23 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 or six months ended June 30, 2017. During the second quarter of 2016, we determined that certain pension benefit improvements made in 2009 had not been fully reflected in our projected benefit obligation. Because the amounts were not material to our consolidated financial statements in any individual period, and the cumulative amount was not material to 2016 results, we recognized a one-time, non-cash charge of $7.7 million in "Selling, general and administrative expenses" and a $12.8 million pre-tax increase to “Accumulated other comprehensive loss” in our second quarter 2016 consolidated condensed financial statements to correctly state the pension benefit obligation and account for these 2009 benefit improvements.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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