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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of revenues |  |  |
Revenues | $ 1,328,129 | $ 1,961,720 | $ 2,002,857
Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,232,272 | 1,762,442 | 1,844,808
Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 42,912 | 51,735 |
Transportation revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 21,129 | 99,503 | 112,385
Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 31,816 | 48,040 | 45,664
Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 770,051 | 1,236,308 | 1,321,089
Illinois Basin | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 755,208 | 1,128,588 | 1,197,143
Illinois Basin | Transportation revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 12,817 | 94,686 | 106,947
Illinois Basin | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,026 | 13,034 | 16,999
Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 500,330 | 644,389 | 643,965
Appalachia | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 477,064 | 628,406 | 635,530
Appalachia | Transportation revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 8,312 | 4,817 | 5,435
Appalachia | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 14,954 | 11,166 | 3,000
Minerals |  |  |
Disaggregation of revenues |  |  |
Revenues | 43,141 | 53,036 |
Minerals | Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 42,912 | 51,735 |
Minerals | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 229 | 1,301 |
Other and Corporate |  |  |
Disaggregation of revenues |  |  |
Revenues | 25,124 | 56,850 | 81,492
Other and Corporate | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues |  | 22,138 | 43,393
Other and Corporate | Transportation revenues |  |  |
Disaggregation of revenues |  |  |
Revenues |  |  | 3
Other and Corporate | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 25,124 | 34,712 | 38,096
Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (10,517) | (28,863) | (43,689)
Elimination | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues |  | (16,690) | (31,258)
Elimination | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | (10,517) | (12,173) | (12,431)
Elimination | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues |  | 16,690 | 31,191
Elimination | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues |  |  | 67
Elimination | Other and Corporate |  |  |
Disaggregation of revenues |  |  |
Revenues | $ 10,517 | $ 12,173 | $ 12,431

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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