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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Disaggregation of revenues |  |  |  |
Revenues | $ 255,202 | $ 517,054 | $ 605,965 | $ 1,043,656
Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 236,286 | 461,310 | 550,923 | 937,326
Oil & gas royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 7,786 | 11,892 | 22,025 | 22,285
Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 5,757 | 32,630 | 10,496 | 62,868
Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 5,373 | 11,222 | 22,521 | 21,177
Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 137,787 | 335,673 | 341,659 | 685,069
Illinois Basin | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 134,160 | 301,981 | 333,258 | 619,251
Illinois Basin | Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 3,153 | 31,287 | 7,009 | 60,525
Illinois Basin | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 474 | 2,405 | 1,392 | 5,293
Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 107,110 | 160,244 | 235,213 | 319,648
Appalachia | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 102,126 | 157,951 | 217,665 | 315,404
Appalachia | Transportation revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 2,604 | 1,343 | 3,487 | 2,343
Appalachia | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 2,380 | 950 | 14,061 | 1,901
Minerals |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 7,847 | 12,428 | 22,110 | 23,156
Minerals | Oil & gas royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 7,786 | 11,892 | 22,025 | 22,285
Minerals | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 61 | 536 | 85 | 871
Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 4,955 | 15,990 | 12,339 | 30,152
Other and Corporate | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 5,551 |  | 10,841
Other and Corporate | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 4,955 | 10,439 | 12,339 | 19,311
Elimination |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (2,497) | (7,281) | (5,356) | (14,369)
Elimination | Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | (4,173) |  | (8,170)
Elimination | Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (2,497) | (3,108) | (5,356) | (6,199)
Elimination | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 4,173 |  | 8,170
Elimination | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | $ 2,497 | $ 3,108 | $ 5,356 | $ 6,199

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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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