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ACCRUED WORKERS' COMPENSATION AND PNEUMOCONIOSIS BENEFITS - Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Accrued Workers Compensation And Pneumoconiosis Benefits |  |  |
Workers' compensation expense | $ 17,541 | $ 11,270 | $ 12,215
Total expense | 18,596 | 16,339 | 14,933
Pneumoconiosis benefits |  |  |
Accrued Workers Compensation And Pneumoconiosis Benefits |  |  |
Service cost | 2,593 | 2,525 | 2,255
Interest cost | 3,044 | 2,542 | 2,555
Net amortization | (4,582) | 2 | (2,092)
Net periodic benefit cost | $ 1,055 | $ 5,069 | $ 2,718

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