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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Net Pension Income or Postretirement Expense | Net pension expense (income) for our domestic and foreign plans was as follows:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30, |  | June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net pension expense (income) | $ | 78 |  |  | $ | (491 | ) |  | $ | 157 |  |  | $ | (924 | )
The components of net pension expense (income) for our domestic and foreign plans include the following:
| Domestic Pension Plans |  | Foreign Pension Plans
| Three Months Ended |  | Three Months Ended
| June 30, |  | June 30, |  | June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | 11 |  |  | $ | 12 |
Interest cost | 1,781 |  |  | 2,068 |  |  | 11 |  |  | 9 |
Expected return on plan assets (1) | (3,225 | ) |  | (4,060 | ) |  | (6 | ) |  | (5 | )
Amortization of loss | 1,466 |  |  | 1,446 |  |  | 40 |  |  | 39 |
Expense (income), net | $ | 22 |  |  | $ | (546 | ) |  | $ | 56 |  |  | $ | 55 |
(1) Expected return on plan assets is net of expected investment expenses and certain administrative expenses.
| Domestic Pension Plans |  | Foreign Pension Plans
| Six Months Ended |  | Six Months Ended
| June 30, |  | June 30, |  | June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | 22 |  |  | $ | 24 |
Interest cost | 3,562 |  |  | 4,136 |  |  | 22 |  |  | 17 |
Expected return on plan assets (1) | (6,450 | ) |  | (8,121 | ) |  | (13 | ) |  | (10 | )
Amortization of loss | 2,932 |  |  | 2,892 |  |  | 82 |  |  | 77 |
Other cost due to retirement | — |  |  | 61 |  |  | — |  |  | — |
Expense (income), net | $ | 44 |  |  | $ | (1,032 | ) |  | $ | 113 |  |  | $ | 108 |
(1) Expected return on plan assets is net of expected investment expenses and certain administrative expenses. Net post-retirement expense for our other post-retirement plan includes the following components:
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30, |  | June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 39 |  |  | 40 |  |  | 78 |  |  | 80 |
Amortization of gain | (11 | ) |  | (25 | ) |  | (23 | ) |  | (50 | )
Expense, net | $ | 28 |  |  | $ | 15 |  |  | $ | 56 |  |  | $ | 31 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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