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SEGMENT INFORMATION - Segment Results (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reportable segment results      
Revenues $ 2,566,701 $ 2,419,967 $ 1,579,230
Segment Adjusted EBITDA Expense 1,404,718 1,283,878 953,757
Segment Adjusted EBITDA 1,012,173 1,032,569 557,398
Total assets 2,788,426 2,728,021 2,227,481
Capital expenditures 379,338 286,394 122,984
Other revenues      
Reportable segment results      
Revenues 76,450 52,818 38,517
Coal Royalties      
Reportable segment results      
Revenues 65,614 60,680 51,471
Operating segments      
Reportable segment results      
Revenues 2,566,701    
Operating segments | Illinois Basin Coal      
Reportable segment results      
Revenues 1,481,556 1,296,305 919,597
Segment Adjusted EBITDA Expense 861,288 806,080 613,303
Segment Adjusted EBITDA 514,118 420,684 265,292
Total assets 966,102 779,018 676,091
Capital expenditures 257,885 158,624 60,166
Operating segments | Illinois Basin Coal | Other revenues      
Reportable segment results      
Revenues 10,505 6,822 4,666
Operating segments | Appalachia Coal      
Reportable segment results      
Revenues 883,334 928,087 545,539
Segment Adjusted EBITDA Expense 516,471 464,029 344,332
Segment Adjusted EBITDA 330,723 426,402 172,601
Total assets 488,427 431,913 420,144
Capital expenditures 116,217 76,603 47,577
Operating segments | Appalachia Coal | Other revenues      
Reportable segment results      
Revenues 1,885 1,481 3,940
Operating segments | Oil & Gas Royalties      
Reportable segment results      
Revenues 141,525 154,897 86,439
Segment Adjusted EBITDA Expense 16,532 15,395 11,051
Segment Adjusted EBITDA 121,508 143,179 76,920
Total assets 781,184 778,465 698,702
Operating segments | Oil & Gas Royalties | Other revenues      
Reportable segment results      
Revenues 3,774 3,837 2,256
Operating segments | Coal Royalties      
Reportable segment results      
Revenues 42 56 69
Segment Adjusted EBITDA Expense 24,451 21,871 18,269
Segment Adjusted EBITDA 41,163 38,809 33,202
Total assets 315,592 321,587 285,943
Capital expenditures 400 38,276 45
Operating segments | Coal Royalties | Other revenues      
Reportable segment results      
Revenues 42 56 69
Other, Corporate and Elimination      
Reportable segment results      
Revenues (5,328) (20,002) (23,816)
Segment Adjusted EBITDA Expense (14,024) (23,497) (33,198)
Segment Adjusted EBITDA 4,661 3,495 9,383
Total assets 237,121 417,038 146,601
Capital expenditures 4,836 12,891 15,196
Other, Corporate and Elimination | Other revenues      
Reportable segment results      
Revenues 60,244 40,622 27,586
Elimination      
Reportable segment results      
Revenues (65,572) (60,624) (51,402)
Elimination | Coal Royalties      
Reportable segment results      
Revenues $ 65,572 $ 60,624 $ 51,402