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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation of revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of revenues |  |
Revenues | $ 350,763 | $ 526,602
Coal sales |  |
Disaggregation of revenues |  |
Revenues | 314,637 | 476,016
Oil & gas royalties |  |
Disaggregation of revenues |  |
Revenues | 14,239 | 10,393
Transportation revenues |  |
Disaggregation of revenues |  |
Revenues | 4,739 | 30,238
Other revenues |  |
Disaggregation of revenues |  |
Revenues | 17,148 | 9,955
Illinois Basin |  |
Disaggregation of revenues |  |
Revenues | 203,872 | 349,396
Illinois Basin | Coal sales |  |
Disaggregation of revenues |  |
Revenues | 199,098 | 317,270
Illinois Basin | Transportation revenues |  |
Disaggregation of revenues |  |
Revenues | 3,856 | 29,238
Illinois Basin | Other revenues |  |
Disaggregation of revenues |  |
Revenues | 918 | 2,888
Appalachia |  |
Disaggregation of revenues |  |
Revenues | 128,103 | 159,404
Appalachia | Coal sales |  |
Disaggregation of revenues |  |
Revenues | 115,539 | 157,453
Appalachia | Transportation revenues |  |
Disaggregation of revenues |  |
Revenues | 883 | 1,000
Appalachia | Other revenues |  |
Disaggregation of revenues |  |
Revenues | 11,681 | 951
Minerals |  |
Disaggregation of revenues |  |
Revenues | 14,263 | 10,728
Minerals | Oil & gas royalties |  |
Disaggregation of revenues |  |
Revenues | 14,239 | 10,393
Minerals | Other revenues |  |
Disaggregation of revenues |  |
Revenues | 24 | 335
Other and Corporate |  |
Disaggregation of revenues |  |
Revenues | 7,384 | 14,162
Other and Corporate | Coal sales |  |
Disaggregation of revenues |  |
Revenues |  | 5,290
Other and Corporate | Other revenues |  |
Disaggregation of revenues |  |
Revenues | 7,384 | 8,872
Operating segments |  |
Disaggregation of revenues |  |
Revenues | 350,763 | 526,602
Operating segments | Illinois Basin |  |
Disaggregation of revenues |  |
Revenues | 203,872 | 345,399
Operating segments | Appalachia |  |
Disaggregation of revenues |  |
Revenues | 128,103 | 159,404
Operating segments | Minerals |  |
Disaggregation of revenues |  |
Revenues | 14,263 | 10,728
Operating segments | Other and Corporate |  |
Disaggregation of revenues |  |
Revenues | 4,525 | 11,071
Elimination |  |
Disaggregation of revenues |  |
Revenues | (2,859) | (7,088)
Elimination | Coal sales |  |
Disaggregation of revenues |  |
Revenues |  | (3,997)
Elimination | Other revenues |  |
Disaggregation of revenues |  |
Revenues | (2,859) | (3,091)
Elimination | Illinois Basin |  |
Disaggregation of revenues |  |
Revenues |  | 3,997
Elimination | Other and Corporate |  |
Disaggregation of revenues |  |
Revenues | $ 2,859 | $ 3,091

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