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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation of revenues |  |  |  |
Revenues | $ 362,443 | $ 255,202 | $ 681,065 | $ 605,965
Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 218,233 | 137,787 | 409,167 | 341,659
Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 120,723 | 107,110 | 229,342 | 235,213
Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 17,587 | 7,847 | 31,607 | 22,110
Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 11,653 | 6,778 | 22,954 | 18,154
Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 8,547 | 4,955 | 16,315 | 12,334
Operating segments |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 362,443 | 255,202 | 681,065 | 605,965
Operating segments | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 218,233 | 137,787 | 409,167 | 341,659
Operating segments | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 120,723 | 107,110 | 229,342 | 235,213
Operating segments | Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 17,587 | 7,847 | 31,607 | 22,110
Operating segments | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  |  |  | 5
Operating segments | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 5,900 | 2,458 | 10,949 | 6,978
Elimination |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (14,300) | (9,275) | (28,320) | (23,505)
Elimination | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 11,653 | 6,778 | 22,954 | 18,149
Elimination | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 2,647 | 2,497 | 5,366 | 5,356
Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 325,974 | 236,286 | 613,461 | 550,923
Coal sales | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 210,157 | 134,160 | 392,798 | 333,258
Coal sales | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 115,817 | 102,126 | 220,663 | 217,665
Coal royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 0 |  |
Coal royalties | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 11,653 | 6,778 | 22,954 | 18,149
Coal royalties | Elimination |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (11,653) | (6,778) | (22,954) | (18,149)
Oil & gas royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 17,114 | 7,786 | 31,113 | 22,025
Oil & gas royalties | Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 17,114 | 7,786 | 31,113 | 22,025
Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 12,058 | 5,757 | 23,126 | 10,496
Transportation revenues | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 7,434 | 3,153 | 15,114 | 7,009
Transportation revenues | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 4,624 | 2,604 | 8,012 | 3,487
Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 7,297 | 5,373 | 13,365 | 22,521
Other revenues | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 642 | 474 | 1,255 | 1,392
Other revenues | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 282 | 2,380 | 667 | 14,061
Other revenues | Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 473 | 61 | 494 | 85
Other revenues | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  |  |  | 5
Other revenues | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 8,547 | 4,955 | 16,315 | 12,334
Other revenues | Elimination |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | $ (2,647) | $ (2,497) | $ (5,366) | $ (5,356)

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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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