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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of revenues |  |  |
Revenues | $ 2,406,511 | $ 1,569,976 | $ 1,328,129
Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,296,305 | 919,597 | 769,957
Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 928,087 | 545,539 | 500,330
Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 141,441 | 77,185 | 43,141
Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 60,680 | 51,471 | 42,217
Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (20,002) | (23,816) | (27,516)
Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,102,229 | 1,386,923 | 1,232,272
Coal sales | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,219,943 | 873,930 | 755,208
Coal sales | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 882,286 | 512,993 | 477,064
Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 138,402 | 74,988 | 42,912
Oil & gas royalties | Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 138,402 | 74,988 | 42,912
Coal royalties | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 60,624 | 51,402 | 42,112
Coal royalties | Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (60,624) | (51,402) | (42,112)
Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 113,860 | 69,607 | 21,129
Transportation | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 69,540 | 41,001 | 12,817
Transportation | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 44,320 | 28,606 | 8,312
Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 52,020 | 38,458 | 31,816
Other revenues | Illinois Basin |  |  |
Disaggregation of revenues |  |  |
Revenues | 6,822 | 4,666 | 1,932
Other revenues | Appalachia |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,481 | 3,940 | 14,954
Other revenues | Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 3,039 | 2,197 | 229
Other revenues | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 56 | 69 | 105
Other revenues | Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | $ 40,622 | $ 27,586 | $ 14,596

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