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RETIREMENT ANNUITY AND GUARANTEED CONTINUOUS EMPLOYMENT PLANS (Components of Pension Cost for Defined Benefit Plans) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of Pension Cost for Defined Benefit Plan |  |  |  |  |  |  |
Settlement/curtailment loss |  | $ 1,696 | $ 4,232 | $ 758 |  |  |
Foreign Plan [Member] |  |  |  |  |  |  |
Components of Pension Cost for Defined Benefit Plan |  |  |  |  |  |  |
Service cost |  |  |  |  | $ 2,908 | $ 3,252 | $ 2,678
Interest cost |  |  |  |  | 3,739 | 3,703 | 3,253
Expected return on plan assets |  |  |  |  | (4,430) | (5,057) | (4,270)
Amortization of prior service cost |  |  |  |  | 58 | 1 | 15
Amortization of net loss |  |  |  |  | 2,296 | 2,211 | 1,881
Settlement/curtailment loss | [1] |  |  |  | 266 | (397) | 102
Pension cost for defined benefit plans |  |  |  |  | 4,837 | 3,713 | 3,659
United States |  |  |  |  |  |  |
Components of Pension Cost for Defined Benefit Plan |  |  |  |  |  |  |
Service cost |  |  |  |  | 140 | 139 | 608
Interest cost |  |  |  |  | 18,610 | 18,084 | 19,497
Expected return on plan assets |  |  |  |  | (24,980) | (27,052) | (31,530)
Amortization of prior service cost |  |  |  |  | 0 | 0 | 0
Amortization of net loss |  |  |  |  | 1,654 | 1,498 | 2,133
Settlement/curtailment loss | [1] |  |  |  | 0 | 6,686 | 8,150
Pension cost for defined benefit plans |  |  |  |  | $ (4,576) | $ (645) | $ (1,142)
[1] | Pension settlement charges resulting from lump sum pension payments.

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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=108410482&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=112275985&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=108410482&loc=d3e2709-114920 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 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)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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