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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Amortization of: |  |
Contribution to pension plans | $ 8,000 |
Expected plan contributions | 34,000 |
Pension Benefits |  |
Amortization of: |  |
Net pension expense | 12,071 | $ 6,982
Company Administered Plan | Pension Benefits |  |
Components of net periodic benefit cost |  |
Service cost | 3,032 | 3,201
Interest cost | 21,469 | 19,752
Expected return on plan assets | (22,676) | (25,834)
Amortization of: |  |
Net actuarial loss | 7,610 | 7,372
Prior service cost | 179 | 145
Net pension expense | 9,614 | 4,636
Union Administered Plan | Pension Benefits |  |
Amortization of: |  |
Net pension expense | 2,457 | 2,346
U.S. | Company Administered Plan | Pension Benefits |  |
Amortization of: |  |
Net pension expense | 11,473 | 7,357
Non-U.S. | Company Administered Plan | Pension Benefits |  |
Amortization of: |  |
Net pension expense | $ (1,859) | $ (2,721)

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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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