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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of revenues |  |  |
Revenues | $ 2,566,701 | $ 2,419,967 | $ 1,579,230
Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,210,210 | 2,102,229 | 1,386,923
Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 137,751 | 151,060 | 84,183
Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 142,290 | 113,860 | 69,607
Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 76,450 | 52,818 | 38,517
Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 65,614 | 60,680 | 51,471
Operating segments |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,566,701 |  |
Operating segments | Illinois Basin Coal |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,481,556 | 1,296,305 | 919,597
Operating segments | Illinois Basin Coal | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,364,901 | 1,219,943 | 873,930
Operating segments | Illinois Basin Coal | Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 106,150 | 69,540 | 41,001
Operating segments | Illinois Basin Coal | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 10,505 | 6,822 | 4,666
Operating segments | Appalachia Coal |  |  |
Disaggregation of revenues |  |  |
Revenues | 883,334 | 928,087 | 545,539
Operating segments | Appalachia Coal | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 845,309 | 882,286 | 512,993
Operating segments | Appalachia Coal | Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 36,140 | 44,320 | 28,606
Operating segments | Appalachia Coal | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,885 | 1,481 | 3,940
Operating segments | Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 141,525 | 154,897 | 86,439
Operating segments | Oil & Gas Royalties | Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 137,751 | 151,060 | 84,183
Operating segments | Oil & Gas Royalties | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 3,774 | 3,837 | 2,256
Operating segments | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 42 | 56 | 69
Operating segments | Coal Royalties | Coal royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 65,572 | 60,624 | 51,402
Operating segments | Coal Royalties | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 42 | 56 | 69
Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (5,328) | (20,002) | (23,816)
Other, Corporate and Elimination | Coal royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | (65,572) | (60,624) | (51,402)
Other, Corporate and Elimination | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 60,244 | 40,622 | 27,586
Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | (65,572) | (60,624) | (51,402)
Elimination | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | $ 65,572 | $ 60,624 | $ 51,402

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