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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income tax benefits reclassified from accumulated other comprehensive loss to income tax expense |  |  |  |
Income tax benefit | $ 1,100 | $ 700 | $ 3,200 | $ 2,200
Other Postretirement Benefits Plan |  |  |  |
Components of net periodic benefit cost (income) |  |  |  |
Service cost | 115 | 117 | 345 | 351
Interest cost | 442 | 509 | 1,326 | 1,527
Expected return on plan assets | (722) | (570) | (2,166) | (1,710)
Amortization of prior service cost (credit) | 0 | (57) | 0 | (171)
Amortization of net loss | 1 | 74 | 3 | 222
Net periodic benefit cost (income) | (164) | 73 | (492) | 219
Retirement Benefits |  |  |  |
Components of net periodic benefit cost (income) |  |  |  |
Service cost | 2,036 | 1,954 | 6,108 | 5,862
Interest cost | 4,574 | 5,126 | 13,722 | 15,378
Expected return on plan assets | (6,232) | (5,892) | (18,696) | (17,676)
Amortization of prior service cost (credit) | 28 | 0 | 84 | 0
Amortization of net loss | 4,571 | 3,158 | 13,713 | 9,474
Net periodic benefit cost (income) | $ 4,977 | $ 4,346 | $ 14,931 | $ 13,038

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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=118257860&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=118255775&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=118255775&loc=d3e2709-114920 + Details
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