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Pension and Postretirement Benefits - Summary of Funded Status of the Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Domestic Plans |  |  |
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | $ 11,590 |  |
Fair value of plan assets at end of year | 10,299 | $ 11,590 |
Foreign Pension Plans |  |  |
Change in benefit obligation: |  |  |
Service cost | 552 | 530 | $ 488
Interest cost | 381 | 492 | 488
Actuarial adjustments | (238) | (106) | 158
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 9,493 |  |
Fair value of plan assets at end of year | 8,243 | 9,493 |
Foreign Pension Plans | Funded Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 9,521 | 10,488 |
Service cost | 552 | 530 |
Interest cost | 308 | 406 |
Actuarial adjustments | (809) | 658 |
Benefits paid | (732) | (3,231) |
Translation adjustment | (706) | 670 |
Benefit obligation at end of year | 8,134 | 9,521 | 10,488
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 9,493 | 10,576 |
Actual return on plan assets | (322) | 764 |
Company contributions | 514 | 710 |
Benefits paid | (732) | (3,231) |
Translation adjustment | (710) | 674 |
Fair value of plan assets at end of year | 8,243 | 9,493 | 10,576
Funded status at end of year | 109 | (28) |
Foreign Pension Plans | Unfunded Pension Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 2,582 | 2,486 |
Interest cost | 73 | 87 |
Actuarial adjustments | (25) | (54) |
Benefits paid | (184) | (182) |
Translation adjustment | (156) | 245 |
Benefit obligation at end of year | 2,290 | 2,582 | 2,486
Change in plan assets: |  |  |
Company contributions | 184 | 182 |
Benefits paid | (184) | (182) |
Funded status at end of year | (2,290) | (2,582) |
Pension Plans | Domestic Plans |  |  |
Change in benefit obligation: |  |  |
Service cost | 64 | 64 | 98
Interest cost | 780 | 803 | 1,032
Actuarial adjustments | (76) | 114 | 1
Pension Plans | Domestic Plans | Funded Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 15,440 | 15,027 |
Interest cost | 481 | 492 |
Actuarial adjustments | (887) | 618 |
Benefits paid | (799) | (697) |
Benefit obligation at end of year | 14,235 | 15,440 | 15,027
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 11,590 | 10,416 |
Actual return on plan assets | (1,043) | 855 |
Company contributions | 551 | 1,016 |
Benefits paid | (799) | (697) |
Fair value of plan assets at end of year | 10,299 | 11,590 | 10,416
Funded status at end of year | (3,936) | (3,850) |
Pension Plans | Domestic Plans | Unfunded Pension Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 9,857 | 9,825 |
Service cost | 64 | 64 |
Interest cost | 299 | 311 |
Actuarial adjustments | (425) | 175 |
Benefits paid | (524) | (518) |
Benefit obligation at end of year | 9,271 | 9,857 | 9,825
Change in plan assets: |  |  |
Company contributions | 524 | 518 |
Benefits paid | (524) | (518) |
Funded status at end of year | (9,271) | (9,857) |
Postretirement Benefit Plans | Domestic Plans |  |  |
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | 13,807 | 13,619 |
Service cost | 80 | 92 | 99
Interest cost | 449 | 413 | 573
Actuarial adjustments | 170 | 237 | (790)
Plan amendments |  | 816 |
Benefits paid | (1,052) | (1,370) |
Benefit obligation at end of year | 13,454 | 13,807 | $ 13,619
Change in plan assets: |  |  |
Company contributions | 1,052 | 1,370 |
Benefits paid | (1,052) | (1,370) |
Funded status at end of year | $ (13,454) | $ (13,807) |

X
- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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