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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
RETIREMENT AND POSTRETIREMENT BENEFIT PLANS | RETIREMENT AND POSTRETIREMENT BENEFIT PLANS The components of total pension cost were as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| U.S. pension plans |  | Non-U.S. pension plans |  | U.S. pension plans |  | Non-U.S. pension plans |  | U.S. pension plans |  | Non-U.S. pension plans |  | U.S. pension plans |  | Non-U.S. pension plans
Service cost | $ | 35 |  |  | $ | 832 |  |  | $ | 146 |  |  | $ | 589 |  |  | $ | 70 |  |  | $ | 1,683 |  |  | $ | 296 |  |  | $ | 1,173 |
Interest cost | 4,493 |  |  | 937 |  |  | 4,870 |  |  | 672 |  |  | 8,987 |  |  | 1,907 |  |  | 9,740 |  |  | 1,334 |
Expected return on plan assets | (6,915 | ) |  | (1,266 | ) |  | (7,671 | ) |  | (955 | ) |  | (13,831 | ) |  | (2,540 | ) |  | (15,342 | ) |  | (1,899 | )
Amortization of prior service cost | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | 1 |  |  | — |  |  | 8 |
Amortization of net loss | 384 |  |  | 555 |  |  | 547 |  |  | 464 |  |  | 768 |  |  | 1,130 |  |  | 1,094 |  |  | 917 |
Settlement charges (1) | — |  |  | — |  |  | — |  |  | — |  |  | 758 |  |  | — |  |  | — |  |  | — |
Defined benefit plans | (2,003 | ) |  | 1,058 |  |  | (2,108 | ) |  | 774 |  |  | (3,248 | ) |  | 2,181 |  |  | (4,212 | ) |  | 1,533 |
Multi-employer plans | — |  |  | 234 |  |  | — |  |  | 224 |  |  | — |  |  | 461 |  |  | — |  |  | 417 |
Defined contribution plans | 5,610 |  |  | 1,036 |  |  | 5,436 |  |  | 368 |  |  | 11,504 |  |  | 1,865 |  |  | 11,834 |  |  | 734 |
Total pension cost | $ | 3,607 |  |  | $ | 2,328 |  |  | $ | 3,328 |  |  | $ | 1,366 |  |  | $ | 8,256 |  |  | $ | 4,507 |  |  | $ | 7,622 |  |  | $ | 2,684 |
(1) Pension settlement charges resulting from a lump sum pension payment in the six months ended June 30, 2018. The defined benefit plan components of Total pension cost, other than service cost, are included Other income (expense) in the Company's Consolidated Statements of Income.

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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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