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Retirement Benefits | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The Company sponsors several qualified and nonqualified defined benefit and defined contribution pension plans and other postretirement plans for its employees. The following tables provide the components of net periodic benefit cost for its major defined benefit plans and its other postretirement plans.
| Pension Benefits
| Three Months Ended September 30,
| 2018 |  | 2017
| U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S.
Service cost | $ | 156 |  |  | $ | 520 |  |  | $ | 224 |  |  | $ | 520 |
Interest cost | 669 |  |  | 341 |  |  | 687 |  |  | 332 |
Expected return on plan assets | (991 | ) |  | (276 | ) |  | (986 | ) |  | (277 | )
Net amortization | 664 |  |  | 312 |  |  | 641 |  |  | 418 |
Net periodic benefit cost | $ | 498 |  |  | $ | 897 |  |  | $ | 566 |  |  | $ | 993 |
| Pension Benefits
| Nine Months Ended September 30,
| 2018 |  | 2017
| U.S. |  | Non-U.S. |  | U.S. |  | Non-U.S.
Service cost | $ | 665 |  |  | $ | 1,592 |  |  | $ | 732 |  |  | $ | 1,496 |
Interest cost | 1,975 |  |  | 1,053 |  |  | 2,008 |  |  | 957 |
Expected return on plan assets | (2,957 | ) |  | (848 | ) |  | (2,874 | ) |  | (811 | )
Net amortization | 2,034 |  |  | 964 |  |  | 1,924 |  |  | 1,195 |
Net periodic benefit cost | $ | 1,717 |  |  | $ | 2,761 |  |  | $ | 1,790 |  |  | $ | 2,837 |
| Other Postretirement Benefits
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 167 |  |  | $ | 152 |  |  | $ | 502 |  |  | $ | 456 |
Interest cost | 202 |  |  | 203 |  |  | 608 |  |  | 611 |
Net amortization | (185 | ) |  | (198 | ) |  | (553 | ) |  | (595 | )
Net periodic benefit cost | $ | 184 |  |  | $ | 157 |  |  | $ | 557 |  |  | $ | 472 |
The Company previously disclosed in its financial statements for the year ended December 31, 2017, that it expected to contribute approximately $5.5 million to its defined benefit plans and $0.1 million to its other postretirement benefit plans in 2018. During the first nine months of 2018, the Company contributed a total of $12.6 million to fund these plans and expects to contribute an additional $0.8 million in the remaining three months of 2018. Included in the total of the $12.6 million is a discretionary contribution for $10.3 million to the U.S. pension plan made in the three months ended September 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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