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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Postemployment Benefits [Abstract] |
Summary of Net Periodic Benefit Costs | The net periodic benefit costs for the plans included the following components:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Service cost |  | $ | 708 |  |  | $ | 479 |
Interest cost on projected benefit obligations |  |  | 458 |  |  |  | 377 |
Expected return on plan assets |  |  | (116 | ) |  |  | (84 | )
Amortization of actuarial net loss |  |  | 400 |  |  |  | 406 |
|  | $ | 1,450 |  |  | $ | 1,178 |
Summary of Changes in Projected Benefit Obligations and Plan Assets, and Ending Balances of Defined Benefit Plans | The changes in projected benefit obligations and plan assets, as well as the ending balance sheet amounts for the Company’s defined benefit plans, were as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Change in projected benefit obligations: |  |  |  |  |  |  |  |
Projected benefit obligations, beginning of year(1) |  | $ | 23,450 |  |  | $ | 2,134 |
Liabilities assumed through acquisition |  |  | — |  |  |  | 22,437 |
Service cost |  |  | 708 |  |  |  | 479 |
Interest cost |  |  | 458 |  |  |  | 377 |
Actuarial (gain) loss |  |  | (312 | ) |  |  | 1,085 |
Benefits paid |  |  | (1,271 | ) |  |  | (897 | )
Currency translation adjustments |  |  | 2,703 |  |  |  | (2,165 | )
Projected benefit obligations, end of year |  | $ | 25,736 |  |  | $ | 23,450 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets, beginning of year(1) |  | $ | 7,672 |  |  | $ | 301 |
Assets acquired through acquisition |  |  | — |  |  |  | 7,896 |
Company contributions |  |  | 324 |  |  |  | 741 |
Gain on plan assets |  |  | 177 |  |  |  | 66 |
Benefits paid |  |  | (722 | ) |  |  | (437 | )
Currency translation adjustments |  |  | 701 |  |  |  | (895 | )
Fair value of plan assets, end of year |  |  | 8,152 |  |  |  | 7,672 |
Net underfunded status |  | $ | (17,584 | ) |  | $ | (15,778 | )
(1) | The beginning of the year balances for the year ended December 31, 2016, relate to plans held in Taiwan and Germany in the Vacuum & Analysis segment. These were not disclosed in prior years as the net liability was not material.
Summary of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) | Changes in plan assets and benefit obligations recognized in other comprehensive income (loss) included the following components:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Amounts recognized in accumulated comprehensive income: |  |  |  |  |  |  |  |
Accumulated net actuarial (gain) loss |  | $ | (235 | ) |  | $ | 465 |
Income tax benefit |  |  | (88 | ) |  |  | (199 | )
Accumulated other comprehensive (benefit) loss |  | $ | (323 | ) |  | $ | 266 |
Summary of Estimated Benefit Payments for Next 10 Years | As of December 31, 2017, the estimated benefit payments for the next 10 years were as follows:
|  | Estimated benefit payments |
2018 |  | $ | 2,283 |
2019 |  |  | 2,786 |
2020 |  |  | 2,900 |
2021 |  |  | 2,997 |
2022 |  |  | 2,858 |
2023-2027 |  |  | 13,027 |
|  | $ | 26,851 |
Schedule of Weighted Average Rates Used to Determine Net Periodic Benefit Costs | The weighted-average rates used to determine the net periodic benefit costs were as follows:
|  | December 31, 2017 |
Discount rate |  |  | 1.8 | %
Rate of increase in salary levels |  |  | 2.2 |
Expected long-term rate of return on assets |  |  | 1.9 |
Schedule of Defined Benefit Plan Assets | Plan assets were held in the following categories as a percentage of total plan assets:
|  | Year Ended December 31, |
|  | 2017 |
|  | Amount |  |  | Percentage |
Cash |  | $ | 561 |  |  |  | 7.0 | %
Debt securities |  |  | 5,242 |  |  |  | 64.0 |
Equity securities |  |  | 1,367 |  |  |  | 17.0 |
Other |  |  | 982 |  |  |  | 12.0 |
|  | $ | 8,152 |  |  |  | 100.0 | %

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- Definition Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans. + 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 (a)(b)(c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the changes in plan assets and benefit obligations recognized in other comprehensive income (loss) during the period. + References No definition available. + Details
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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 including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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