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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
United States |  |  |  |
Change in benefit obligation: |  |  |  |
Service cost | $ 2,844 | $ 2,433 | $ 5,693 | $ 4,853
Interest cost | 1,706 | 1,757 | 3,426 | 3,505
Components of net periodic benefit cost: |  |  |  |
Service cost | 2,844 | 2,433 | 5,693 | 4,853
Interest cost | 1,706 | 1,757 | 3,426 | 3,505
Expected return on plan assets | (2,792) | (2,475) | (5,606) | (4,939)
Amortization of net loss | 1,210 | 801 | 2,428 | 1,602
Net periodic benefit cost | 2,968 | 2,516 | 5,941 | 5,021
Minimum funding requirements |  |  | 0 |
Foreign Plans |  |  |  |
Change in benefit obligation: |  |  |  |
Service cost | 1,491 | 1,382 | 3,022 | 2,719
Interest cost | 457 | 438 | 929 | 862
Change in plan assets: |  |  |  |
Employer contribution |  |  | 1,200 |
Components of net periodic benefit cost: |  |  |  |
Service cost | 1,491 | 1,382 | 3,022 | 2,719
Interest cost | 457 | 438 | 929 | 862
Expected return on plan assets | (658) | (586) | (1,337) | (1,154)
Amortization of net loss | 433 | 460 | 879 | 907
Amortization of prior service cost | 125 | 98 | 254 | 192
Net periodic benefit cost | 1,848 | $ 1,792 | 3,747 | $ 3,526
Expected contribution in current fiscal year | $ 3,100 |  | $ 3,100 |

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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation before adjustment for gain (loss) due to settlements or curtailments. + References No definition available. + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + 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)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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