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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of revenues |  |  |  |
Revenues | $ 355,651 | $ 464,726 | $ 961,616 | $ 1,508,382
Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 335,767 | 420,005 | 886,690 | 1,357,331
Oil & gas royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 9,693 | 13,969 | 31,718 | 36,254
Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 6,226 | 20,024 | 16,722 | 82,892
Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 3,965 | 10,728 | 26,486 | 31,905
Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 210,360 | 280,335 | 552,019 | 965,404
Illinois Basin | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 206,356 | 256,293 | 539,614 | 875,544
Illinois Basin | Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 3,722 | 18,778 | 10,731 | 79,303
Illinois Basin | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 282 | 5,264 | 1,674 | 10,557
Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 132,310 | 164,414 | 367,523 | 484,062
Appalachia | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 129,411 | 162,316 | 347,076 | 477,720
Appalachia | Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 2,504 | 1,246 | 5,991 | 3,589
Appalachia | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 395 | 852 | 14,456 | 2,753
Minerals |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 9,721 | 14,177 | 31,831 | 37,333
Minerals | Oil & gas royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 9,693 | 13,969 | 31,718 | 36,254
Minerals | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 28 | 208 | 113 | 1,079
Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 6,070 | 13,123 | 18,409 | 43,275
Other and Corporate | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 5,689 |  | 16,530
Other and Corporate | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 6,070 | 7,434 | 18,409 | 26,745
Elimination |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (2,810) | (7,323) | (8,166) | (21,692)
Elimination | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | (4,293) |  | (12,463)
Elimination | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (2,810) | (3,030) | (8,166) | (9,229)
Elimination | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 4,293 |  | 12,463
Elimination | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | $ 2,810 | $ 3,030 | $ 8,166 | $ 9,229

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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 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: 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=118956577&loc=SL49130545-203045 + Details
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