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Net Periodic Pension Expense Benefit (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Defined Benefit Pension Plans | U.S. |  |  |  |
Defined Benefit Plan, Net Periodic Expense (Benefit) |  |  |  |
Service cost | $ 0 | $ 192 | $ 0 | $ 384
Interest cost | 551 | 675 | 1,102 | 1,351
Expected return on plan assets | (1,094) | (970) | (2,187) | (1,940)
Amortization of net loss | 0 | 0 | 0 | 0
Net periodic (benefit) expense | (543) | (103) | (1,085) | (205)
Defined Benefit Pension Plans | Foreign |  |  |  |
Defined Benefit Plan, Net Periodic Expense (Benefit) |  |  |  |
Service cost | 0 | 262 | 0 | 521
Interest cost | 65 | 73 | 130 | 144
Expected return on plan assets | (65) | (70) | (130) | (138)
Amortization of net loss | 0 | 23 | 0 | 46
Net periodic (benefit) expense | 0 | 288 | 0 | 573
Other Postretirement Benefits Plans |  |  |  |
Defined Benefit Plan, Net Periodic Expense (Benefit) |  |  |  |
Interest cost | 4 | 5 | 8 | 10
Amortization of net loss | 2 | 0 | 3 | 0
Amortization of prior service credit | (58) | (58) | (116) | (116)
Net periodic (benefit) expense | $ (52) | $ (53) | $ (105) | $ (106)

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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 3: 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=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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