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EMPLOYEE BENEFIT PLANS (Components of cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of net periodic benefit cost |  |  |  |
Pension settlement expense |  | $ 8,505 | $ 12,925 | $ 4,156
Noncash charge to pension settlement expense |  | 4,000 |  |
Nonunion Defined Benefit Pension Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Interest cost |  | 624 | 4,269 | 4,514
Expected return on plan assets |  | (31) | (1,582) | (5,712)
Pension settlement expense |  | 4,164 | 12,925 | 4,156
Amortization of net actuarial loss |  | 260 | 2,583 | 3,132
Net periodic benefit cost | $ 12,600 | 5,017 | 18,195 | 6,090
Noncash charge to pension settlement expense |  | 4,000 |  |
Supplemental Benefit Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Interest cost |  | 39 | 108 | 102
Pension settlement expense |  | 370 |  |
Amortization of net actuarial loss |  | 95 | 81 | 82
Net periodic benefit cost |  | 504 | 189 | 184
Postretirement Health Benefit Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost |  | 320 | 366 | 489
Interest cost |  | 1,212 | 837 | 1,060
Amortization of prior service credit |  | (33) | (93) | (190)
Amortization of net actuarial loss |  | 898 | 304 | 694
Net periodic benefit cost |  | $ 2,397 | $ 1,414 | $ 2,053

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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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