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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Amortization of: |  |  |  |
Contribution to pension plans |  |  | $ 19,000 |
Estimated total contributions | $ 28,000 |  | 28,000 |
Pension Benefits |  |  |  |
Amortization of: |  |  |  |
Net pension expense | 6,710 | $ 12,550 | 13,692 | $ 25,907
Union Administered Plan | Pension Benefits |  |  |  |
Amortization of: |  |  |  |
Net pension expense | 2,524 | 2,621 | 4,870 | 5,123
Company Administered Plan | Pension Benefits |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 3,095 | 3,017 | 6,296 | 6,266
Interest cost | 19,098 | 21,426 | 38,850 | 42,915
Expected return on plan assets | (25,065) | (22,712) | (50,899) | (45,190)
Amortization of: |  |  |  |
Net actuarial loss | 6,914 | 8,077 | 14,286 | 16,527
Prior service cost | 144 | 121 | 289 | 266
Net pension expense | 4,186 | 9,929 | 8,822 | 20,784
U.S. | Company Administered Plan | Pension Benefits |  |  |  |
Amortization of: |  |  |  |
Net pension expense | 6,665 | 10,547 | 14,022 | 21,858
Non-U.S. | Company Administered Plan | Pension Benefits |  |  |  |
Amortization of: |  |  |  |
Net pension expense | $ (2,479) | $ (618) | $ (5,200) | $ (1,074)

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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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