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RETIREMENT AND DEFERRED COMPENSATION PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Domestic Plans |  |  |  |
Change in benefit obligation: |  |  |  |
Service cost | $ 2,426 | $ 2,261 | $ 7,279 | $ 6,781
Interest cost | 1,752 | 1,694 | 5,257 | 5,082
Change in plan assets: |  |  |  |
Employer contribution |  |  | 24,700 |
Components of net periodic benefit cost: |  |  |  |
Service cost | 2,426 | 2,261 | 7,279 | 6,781
Interest cost | 1,752 | 1,694 | 5,257 | 5,082
Expected return on plan assets | (2,470) | (2,118) | (7,409) | (6,353)
Amortization of net loss | 801 | 820 | 2,403 | 2,462
Net periodic benefit cost | 2,509 | 2,657 | 7,530 | 7,972
Minimum funding requirements |  |  | 0 |
Foreign Plans |  |  |  |
Change in benefit obligation: |  |  |  |
Service cost | 1,447 | 1,148 | 4,166 | 3,449
Interest cost | 459 | 477 | 1,321 | 1,432
Change in plan assets: |  |  |  |
Employer contribution |  |  | 2,000 |
Components of net periodic benefit cost: |  |  |  |
Service cost | 1,447 | 1,148 | 4,166 | 3,449
Interest cost | 459 | 477 | 1,321 | 1,432
Expected return on plan assets | (627) | (550) | (1,781) | (1,651)
Amortization of net loss | 493 | 388 | 1,400 | 1,165
Amortization of prior service cost | 104 | 89 | 296 | 265
Net periodic benefit cost | 1,876 | $ 1,552 | 5,402 | $ 4,660
Expected contribution in current fiscal year | $ 2,500 |  | $ 2,500 |

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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 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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