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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
United States |  |  |  |
Change in benefit obligation: |  |  |  |
Service cost | $ 3,562 | $ 2,775 | $ 7,139 | $ 5,548
Interest cost | 1,536 | 1,846 | 3,523 | 3,691
Change in plan assets: |  |  |  |
Employer contribution |  |  | 204 |
Components of net periodic benefit cost: |  |  |  |
Service cost | 3,562 | 2,775 | 7,139 | 5,548
Interest cost | 1,536 | 1,846 | 3,523 | 3,691
Expected return on plan assets | (2,702) | (3,095) | (6,124) | (6,189)
Amortization of net loss | 1,294 | 489 | 2,842 | 978
Net periodic benefit cost | 3,690 | 2,015 | 7,380 | 4,028
Minimum funding requirements |  |  | 0 |
Expected contribution in current fiscal year | 200 |  | 200 |
Foreign Plans |  |  |  |
Change in benefit obligation: |  |  |  |
Service cost | 1,767 | 1,445 | 3,535 | 2,905
Interest cost | 340 | 495 | 680 | 996
Change in plan assets: |  |  |  |
Employer contribution |  |  | 1,100 |
Components of net periodic benefit cost: |  |  |  |
Service cost | 1,767 | 1,445 | 3,535 | 2,905
Interest cost | 340 | 495 | 680 | 996
Expected return on plan assets | (631) | (586) | (1,265) | (1,178)
Amortization of net loss | 514 | 359 | 1,028 | 722
Amortization of prior service cost | 95 | 113 | 192 | 226
Net periodic benefit cost | $ 2,085 | $ 1,826 | $ 4,170 | $ 3,671

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of 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)(4) -URI http://asc.fasb.org/extlink&oid=118255775&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=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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