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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Components of cost) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Components of net periodic benefit cost |  |  |  |
Pension settlement expense |  |  | $ 8,135 | $ 1,603
Noncash charge to pension settlement expense | $ 4,000 |  | 4,000 |
Nonunion Defined Benefit Pension Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Interest cost | 138 | $ 1,136 | 624 | 3,259
Expected return on plan assets | 29 | (363) | (60) | (1,142)
Pension settlement expense | 2,530 | 518 | 4,164 | 1,603
Amortization of net actuarial loss | 50 | 494 | 260 | 1,864
Net periodic benefit cost | 2,747 | 1,785 | 4,988 | 5,584
Noncash charge to pension settlement expense | 4,000 |  | 4,000 |
Supplemental Benefit Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Interest cost | 9 | 27 | 29 | 81
Amortization of net actuarial loss | 24 | 20 | 71 | 60
Net periodic benefit cost | 33 | 47 | 100 | 141
Postretirement Health Benefit Plan |  |  |  |
Components of net periodic benefit cost |  |  |  |
Service cost | 80 | 92 | 240 | 275
Interest cost | 303 | 209 | 909 | 628
Amortization of prior service credit | (8) | (23) | (25) | (70)
Amortization of net actuarial loss | 225 | 76 | 674 | 228
Net periodic benefit cost | $ 600 | $ 354 | $ 1,798 | $ 1,061

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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=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)(5) -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)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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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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