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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Foreign Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | $ 832 | $ 589 | $ 1,683 | $ 1,173
Interest cost |  | 937 | 672 | 1,907 | 1,334
Expected return on plan assets |  | (1,266) | (955) | (2,540) | (1,899)
Amortization of prior service cost |  | 0 | 4 | 1 | 8
Amortization of net loss |  | 555 | 464 | 1,130 | 917
Settlement charges (1) | [1] | 0 | 0 | 0 | 0
Defined benefit plans |  | 1,058 | 774 | 2,181 | 1,533
Multi-employer plans |  | 234 | 224 | 461 | 417
Defined contribution plans |  | 1,036 | 368 | 1,865 | 734
Total pension cost |  | 2,328 | 1,366 | 4,507 | 2,684
Domestic Plan [Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost |  | 35 | 146 | 70 | 296
Interest cost |  | 4,493 | 4,870 | 8,987 | 9,740
Expected return on plan assets |  | (6,915) | (7,671) | (13,831) | (15,342)
Amortization of prior service cost |  | 0 | 0 | 0 | 0
Amortization of net loss |  | 384 | 547 | 768 | 1,094
Settlement charges (1) | [1] | 0 | 0 | 758 | 0
Defined benefit plans |  | (2,003) | (2,108) | (3,248) | (4,212)
Multi-employer plans |  | 0 | 0 | 0 | 0
Defined contribution plans |  | 5,610 | 5,436 | 11,504 | 11,834
Total pension cost |  | $ 3,607 | $ 3,328 | $ 8,256 | $ 7,622
[1] | Pension settlement charges resulting from a lump sum pension payment in the six months ended June 30, 2018.

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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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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for 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)(1) -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 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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