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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of revenues |  |  |  |
Revenues | $ 415,439 | $ 355,651 | $ 1,096,504 | $ 961,616
Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 231,093 | 210,319 | 640,260 | 551,978
Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 154,944 | 132,310 | 384,286 | 367,523
Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 21,191 | 9,721 | 52,798 | 31,831
Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 13,456 | 11,448 | 36,410 | 29,602
Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (5,245) | (8,147) | (17,250) | (19,318)
Operating segments |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 415,439 | 355,651 | 1,096,504 | 961,616
Operating segments | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 231,093 | 210,319 | 640,260 | 551,978
Operating segments | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 154,944 | 132,310 | 384,286 | 367,523
Operating segments | Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 21,191 | 9,721 | 52,798 | 31,831
Operating segments | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 42 |  | 47
Elimination | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 13,456 | 11,406 | 36,410 | 29,555
Coal sales |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 362,264 | 335,767 | 975,725 | 886,690
Coal sales | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 217,637 | 206,356 | 610,435 | 539,614
Coal sales | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 144,627 | 129,411 | 365,290 | 347,076
Coal royalties | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 13,456 | 11,406 | 36,410 | 29,555
Coal royalties | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | (13,456) | (11,406) | (36,410) | (29,555)
Oil & gas royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 20,109 | 9,693 | 51,222 | 31,718
Oil & gas royalties | Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 20,109 | 9,693 | 51,222 | 31,718
Transportation |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 22,027 | 6,226 | 45,153 | 16,722
Transportation | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 12,121 | 3,722 | 27,235 | 10,731
Transportation | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 9,906 | 2,504 | 17,918 | 5,991
Other revenues |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 11,039 | 3,965 | 24,404 | 26,486
Other revenues | Illinois Basin |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 1,335 | 241 | 2,590 | 1,633
Other revenues | Appalachia |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 411 | 395 | 1,078 | 14,456
Other revenues | Oil & Gas Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | 1,082 | 28 | 1,576 | 113
Other revenues | Coal Royalties |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues |  | 42 |  | 47
Other revenues | Other and Corporate |  |  |  |
Disaggregation of revenues |  |  |  |
Revenues | $ 8,211 | $ 3,259 | $ 19,160 | $ 10,237

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