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EMPLOYEE BENEFIT PLANS (Details 4) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
COMPONENTS OF NET PERIODIC BENEFIT COST: |  |  |
Service cost | $ 1,482 | $ 1,516 | $ 1,468
Interest cost | 1,273 | 1,292 | 1,430
Expected return on plan assets | (2,798) | (2,539) | (2,275)
Special termination benefit liability | 63 | 0 | 0
Recognized net actuarial loss | 1,548 | 1,454 | 1,333
Net periodic pension cost | $ 1,568 | $ 1,723 | $ 1,956

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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/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)(3) -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)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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