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REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disaggregation of revenues |  |  |
Revenues | $ 2,448,708 | $ 2,566,701 | $ 2,419,967
Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,111,803 | 2,210,210 | 2,102,229
Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 138,311 | 137,751 | 151,060
Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 112,590 | 142,290 | 113,860
Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 86,004 | 76,450 | 52,818
Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 69,741 | 65,614 | 60,680
Operating Segments |  |  |
Disaggregation of revenues |  |  |
Revenues | 2,448,262 | 2,572,029 | 2,439,969
Operating Segments | Illinois Basin Coal |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,496,143 | 1,481,556 | 1,296,305
Operating Segments | Illinois Basin Coal | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 1,399,100 | 1,364,901 | 1,219,943
Operating Segments | Illinois Basin Coal | Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 85,142 | 106,150 | 69,541
Operating Segments | Illinois Basin Coal | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 11,901 | 10,505 | 6,821
Operating Segments | Appalachia Coal |  |  |
Disaggregation of revenues |  |  |
Revenues | 743,242 | 883,334 | 928,087
Operating Segments | Appalachia Coal | Coal sales |  |  |
Disaggregation of revenues |  |  |
Revenues | 712,703 | 845,309 | 882,286
Operating Segments | Appalachia Coal | Transportation |  |  |
Disaggregation of revenues |  |  |
Revenues | 27,448 | 36,140 | 44,319
Operating Segments | Appalachia Coal | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 3,091 | 1,885 | 1,482
Operating Segments | Oil & Gas Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 139,136 | 141,525 | 154,897
Operating Segments | Oil & Gas Royalties | Oil & gas royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 138,311 | 137,751 | 151,060
Operating Segments | Oil & Gas Royalties | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 825 | 3,774 | 3,837
Operating Segments | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 69,741 | 65,614 | 60,680
Operating Segments | Coal Royalties | Coal royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | 69,676 | 65,572 | 60,624
Operating Segments | Coal Royalties | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 65 | 42 | 56
Other, Corporate and Elimination |  |  |
Disaggregation of revenues |  |  |
Revenues | 446 | (5,328) | (20,002)
Other, Corporate and Elimination | Coal royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | (69,676) | (65,572) | (60,624)
Other, Corporate and Elimination | Other revenues |  |  |
Disaggregation of revenues |  |  |
Revenues | 70,122 | 60,244 | 40,622
Elimination | Coal Royalties |  |  |
Disaggregation of revenues |  |  |
Revenues | $ (69,676) | $ (65,572) | $ (60,624)

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